ng_ipv6: set default values for src and dst in ng_ipv6_hdr_build()
ng_ipv6: set default values for src and dst in ng_ipv6_hdr_build()

Later in the handling of IPv6 headers, the source address is only
automatically chosen and filled into the header if the unspecified
address is found in the src field, but it's never set to that value.

The default destination address is set to '::1'.

immesys/RiSyn,ximus/RIOT,mfrey/RIOT,syin2/RIOT,msolters/RIOT,ThanhVic/RIOT,ant9000/RIOT,basilfx/RIOT,altairpearl/RIOT,haoyangyu/RIOT,DipSwitch/RIOT,khhhh/RIOT,syin2/RIOT,MohmadAyman/RIOT,x3ro/RIOT,kushalsingh007/RIOT,kb2ma/RIOT,adjih/RIOT,Josar/RIOT,EmuxEvans/RIOT,authmillenon/RIOT,khhhh/RIOT,ThanhVic/RIOT,Hyungsin/RIOT-OS,daniel-k/RIOT,patkan/RIOT,Yonezawa-T2/RIOT,TobiasFredersdorf/RIOT,stevenj/RIOT,rfuentess/RIOT,zhuoshuguo/RIOT,asanka-code/RIOT,jbeyerstedt/RIOT-OTA-update,l3nko/RIOT,wentaoshang/RIOT,plushvoxel/RIOT,hamilton-mote/RIOT-OS,bartfaizoltan/RIOT,kb2ma/RIOT,luciotorre/RIOT,attdona/RIOT,alex1818/RIOT,roberthartung/RIOT,RubikonAlpha/RIOT,LudwigOrtmann/RIOT,brettswann/RIOT,stevenj/RIOT,RubikonAlpha/RIOT,immesys/RiSyn,jremmert-phytec-iot/RIOT,wentaoshang/RIOT,watr-li/RIOT,rfuentess/RIOT,bartfaizoltan/RIOT,miri64/RIOT,shady33/RIOT,MonsterCode8000/RIOT,Osblouf/RIOT,x3ro/RIOT,centurysys/RIOT,ximus/RIOT,rousselk/RIOT,FrancescoErmini/RIOT,MohmadAyman/RIOT,plushvoxel/RIOT,sgso/RIOT,kaspar030/RIOT,OlegHahm/RIOT,arvindpdmn/RIOT,Josar/RIOT,jasonatran/RIOT,PSHIVANI/Riot-Code,benoit-canet/RIOT,benoit-canet/RIOT,mziegert/RIOT,BytesGalore/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,roberthartung/RIOT,thomaseichinger/RIOT,thomaseichinger/RIOT,LudwigKnuepfer/RIOT,LudwigOrtmann/RIOT,neumodisch/RIOT,ximus/RIOT,RBartz/RIOT,alignan/RIOT,LudwigOrtmann/RIOT,josephnoir/RIOT,zhuoshuguo/RIOT,alignan/RIOT,dkm/RIOT,ntrtrung/RIOT,Darredevil/RIOT,tdautc19841202/RIOT,dhruvvyas90/RIOT,sgso/RIOT,aeneby/RIOT,Osblouf/RIOT,alex1818/RIOT,adrianghc/RIOT,authmillenon/RIOT,daniel-k/RIOT,robixnai/RIOT,gautric/RIOT,BytesGalore/RIOT,OTAkeys/RIOT,gebart/RIOT,benoit-canet/RIOT,ant9000/RIOT,roberthartung/RIOT,backenklee/RIOT,gebart/RIOT,automote/RIOT,tfar/RIOT,Ell-i/RIOT,ant9000/RIOT,katezilla/RIOT,openkosmosorg/RIOT,robixnai/RIOT,BytesGalore/RIOT,sgso/RIOT,rousselk/RIOT,gebart/RIOT,dhruvvyas90/RIOT,rfuentess/RIOT,MarkXYang/RIOT,syin2/RIOT,ntrtrung/RIOT,syin2/RIOT,thiagohd/RIOT,tdautc19841202/RIOT,miri64/RIOT,TobiasFredersdorf/RIOT,khhhh/RIOT,JensErdmann/RIOT,gbarnett/RIOT,automote/RIOT,Darredevil/RIOT,kb2ma/RIOT,kYc0o/RIOT,openkosmosorg/RIOT,beurdouche/RIOT,neiljay/RIOT,sumanpanchal/RIOT,phiros/RIOT,asanka-code/RIOT,TobiasFredersdorf/RIOT,RubikonAlpha/RIOT,sumanpanchal/RIOT,smlng/RIOT,changbiao/RIOT,aeneby/RIOT,rfswarm/RIOT,fnack/RIOT,alex1818/RIOT,LudwigKnuepfer/RIOT,patkan/RIOT,TobiasFredersdorf/RIOT,BytesGalore/RIOT,mfrey/RIOT,jbeyerstedt/RIOT-OTA-update,rfuentess/RIOT,centurysys/RIOT,Darredevil/RIOT,rajma996/RIOT,DipSwitch/RIOT,biboc/RIOT,rakendrathapa/RIOT,centurysys/RIOT,robixnai/RIOT,malosek/RIOT,smlng/RIOT,FrancescoErmini/RIOT,authmillenon/RIOT,fnack/RIOT,l3nko/RIOT,A-Paul/RIOT,EmuxEvans/RIOT,tfar/RIOT,rfswarm/RIOT,altairpearl/RIOT,Yonezawa-T2/RIOT,sgso/RIOT,abp719/RIOT,benoit-canet/RIOT,mtausig/RIOT,DipSwitch/RIOT,DipSwitch/RIOT,thiagohd/RIOT,ThanhVic/RIOT,phiros/RIOT,Hyungsin/RIOT-OS,herrfz/RIOT,sumanpanchal/RIOT,changbiao/RIOT,OlegHahm/RIOT,msolters/RIOT,toonst/RIOT,malosek/RIOT,jremmert-phytec-iot/RIOT,ntrtrung/RIOT,openkosmosorg/RIOT,rousselk/RIOT,sumanpanchal/RIOT,lazytech-org/RIOT,automote/RIOT,luciotorre/RIOT,wentaoshang/RIOT,cladmi/RIOT,kaleb-himes/RIOT,basilfx/RIOT,MonsterCode8000/RIOT,l3nko/RIOT,gebart/RIOT,LudwigKnuepfer/RIOT,neumodisch/RIOT,luciotorre/RIOT,shady33/RIOT,jbeyerstedt/RIOT-OTA-update,hamilton-mote/RIOT-OS,adjih/RIOT,centurysys/RIOT,alignan/RIOT,Yonezawa-T2/RIOT,altairpearl/RIOT,attdona/RIOT,marcosalm/RIOT,kbumsik/RIOT,chris-wood/RIOT,wentaoshang/RIOT,jremmert-phytec-iot/RIOT,thomaseichinger/RIOT,lebrush/RIOT,aeneby/RIOT,ThanhVic/RIOT,RBartz/RIOT,smlng/RIOT,malosek/RIOT,abkam07/RIOT,yogo1212/RIOT,bartfaizoltan/RIOT,mziegert/RIOT,yogo1212/RIOT,chris-wood/RIOT,lazytech-org/RIOT,patkan/RIOT,PSHIVANI/Riot-Code,yogo1212/RIOT,A-Paul/RIOT,altairpearl/RIOT,OlegHahm/RIOT,Yonezawa-T2/RIOT,kYc0o/RIOT,neiljay/RIOT,changbiao/RIOT,rfuentess/RIOT,kaleb-himes/RIOT,stevenj/RIOT,arvindpdmn/RIOT,Osblouf/RIOT,lebrush/RIOT,brettswann/RIOT,ntrtrung/RIOT,FrancescoErmini/RIOT,robixnai/RIOT,abkam07/RIOT,gbarnett/RIOT,JensErdmann/RIOT,JensErdmann/RIOT,fnack/RIOT,bartfaizoltan/RIOT,haoyangyu/RIOT,marcosalm/RIOT,marcosalm/RIOT,tfar/RIOT,rakendrathapa/RIOT,josephnoir/RIOT,binarylemon/RIOT,d00616/RIOT,alex1818/RIOT,rfswarm/RIOT,jasonatran/RIOT,mtausig/RIOT,MonsterCode8000/RIOT,A-Paul/RIOT,kb2ma/RIOT,herrfz/RIOT,dailab/RIOT,backenklee/RIOT,phiros/RIOT,openkosmosorg/RIOT,Darredevil/RIOT,asanka-code/RIOT,kushalsingh007/RIOT,rfswarm/RIOT,LudwigOrtmann/RIOT,immesys/RiSyn,katezilla/RIOT,gautric/RIOT,herrfz/RIOT,cladmi/RIOT,Yonezawa-T2/RIOT,biboc/RIOT,latsku/RIOT,avmelnikoff/RIOT,adrianghc/RIOT,changbiao/RIOT,x3ro/RIOT,kbumsik/RIOT,phiros/RIOT,LudwigKnuepfer/RIOT,khhhh/RIOT,shady33/RIOT,FrancescoErmini/RIOT,LudwigOrtmann/RIOT,hamilton-mote/RIOT-OS,brettswann/RIOT,kbumsik/RIOT,tdautc19841202/RIOT,mtausig/RIOT,dailab/RIOT,adjih/RIOT,lebrush/RIOT,dhruvvyas90/RIOT,khhhh/RIOT,toonst/RIOT,jbeyerstedt/RIOT-OTA-update,thiagohd/RIOT,binarylemon/RIOT,PSHIVANI/Riot-Code,kaspar030/RIOT,jferreir/RIOT,watr-li/RIOT,MohmadAyman/RIOT,cladmi/RIOT,mziegert/RIOT,A-Paul/RIOT,latsku/RIOT,rajma996/RIOT,abp719/RIOT,marcosalm/RIOT,avmelnikoff/RIOT,binarylemon/RIOT,changbiao/RIOT,binarylemon/RIOT,roberthartung/RIOT,RubikonAlpha/RIOT,thiagohd/RIOT,Darredevil/RIOT,gbarnett/RIOT,josephnoir/RIOT,marcosalm/RIOT,roberthartung/RIOT,dkm/RIOT,alignan/RIOT,ant9000/RIOT,neiljay/RIOT,binarylemon/RIOT,koenning/RIOT,Osblouf/RIOT,d00616/RIOT,hamilton-mote/RIOT-OS,benoit-canet/RIOT,JensErdmann/RIOT,daniel-k/RIOT,smlng/RIOT,avmelnikoff/RIOT,jasonatran/RIOT,latsku/RIOT,Lexandro92/RIOT-CoAP,gbarnett/RIOT,automote/RIOT,OTAkeys/RIOT,kaspar030/RIOT,RubikonAlpha/RIOT,jfischer-phytec-iot/RIOT,l3nko/RIOT,zhuoshuguo/RIOT,gebart/RIOT,malosek/RIOT,FrancescoErmini/RIOT,cladmi/RIOT,EmuxEvans/RIOT,kaleb-himes/RIOT,katezilla/RIOT,dailab/RIOT,dhruvvyas90/RIOT,tdautc19841202/RIOT,kerneltask/RIOT,RIOT-OS/RIOT,rfswarm/RIOT,neiljay/RIOT,Hyungsin/RIOT-OS,daniel-k/RIOT,x3ro/RIOT,rajma996/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,thomaseichinger/RIOT,mtausig/RIOT,koenning/RIOT,Josar/RIOT,kbumsik/RIOT,rakendrathapa/RIOT,MarkXYang/RIOT,thiagohd/RIOT,robixnai/RIOT,authmillenon/RIOT,toonst/RIOT,kaleb-himes/RIOT,plushvoxel/RIOT,haoyangyu/RIOT,ks156/RIOT,backenklee/RIOT,jferreir/RIOT,yogo1212/RIOT,phiros/RIOT,ks156/RIOT,watr-li/RIOT,changbiao/RIOT,biboc/RIOT,d00616/RIOT,centurysys/RIOT,kYc0o/RIOT,OTAkeys/RIOT,dhruvvyas90/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,Lexandro92/RIOT-CoAP,toonst/RIOT,dailab/RIOT,toonst/RIOT,kushalsingh007/RIOT,LudwigOrtmann/RIOT,jferreir/RIOT,fnack/RIOT,Ell-i/RIOT,rajma996/RIOT,jasonatran/RIOT,thiagohd/RIOT,malosek/RIOT,zhuoshuguo/RIOT,abp719/RIOT,Hyungsin/RIOT-OS,gbarnett/RIOT,RIOT-OS/RIOT,robixnai/RIOT,chris-wood/RIOT,josephnoir/RIOT,katezilla/RIOT,neumodisch/RIOT,RBartz/RIOT,ximus/RIOT,kerneltask/RIOT,koenning/RIOT,ximus/RIOT,openkosmosorg/RIOT,brettswann/RIOT,MohmadAyman/RIOT,Ell-i/RIOT,mfrey/RIOT,avmelnikoff/RIOT,RubikonAlpha/RIOT,aeneby/RIOT,basilfx/RIOT,abkam07/RIOT,sumanpanchal/RIOT,phiros/RIOT,FrancescoErmini/RIOT,asanka-code/RIOT,latsku/RIOT,daniel-k/RIOT,stevenj/RIOT,MonsterCode8000/RIOT,d00616/RIOT,msolters/RIOT,yogo1212/RIOT,khhhh/RIOT,JensErdmann/RIOT,centurysys/RIOT,ks156/RIOT,malosek/RIOT,tdautc19841202/RIOT,Lexandro92/RIOT-CoAP,chris-wood/RIOT,alex1818/RIOT,jremmert-phytec-iot/RIOT,l3nko/RIOT,lebrush/RIOT,msolters/RIOT,beurdouche/RIOT,jfischer-phytec-iot/RIOT,brettswann/RIOT,sgso/RIOT,jbeyerstedt/RIOT-OTA-update,rousselk/RIOT,beurdouche/RIOT,neumodisch/RIOT,latsku/RIOT,abkam07/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,gbarnett/RIOT,dhruvvyas90/RIOT,shady33/RIOT,kaspar030/RIOT,shady33/RIOT,brettswann/RIOT,Lexandro92/RIOT-CoAP,patkan/RIOT,Ell-i/RIOT,jremmert-phytec-iot/RIOT,automote/RIOT,d00616/RIOT,basilfx/RIOT,PSHIVANI/Riot-Code,aeneby/RIOT,PSHIVANI/Riot-Code,Lexandro92/RIOT-CoAP,attdona/RIOT,MarkXYang/RIOT,abkam07/RIOT,haoyangyu/RIOT,JensErdmann/RIOT,koenning/RIOT,DipSwitch/RIOT,altairpearl/RIOT,MarkXYang/RIOT,rfswarm/RIOT,BytesGalore/RIOT,kushalsingh007/RIOT,fnack/RIOT,arvindpdmn/RIOT,wentaoshang/RIOT,adrianghc/RIOT,benoit-canet/RIOT,watr-li/RIOT,attdona/RIOT,rakendrathapa/RIOT,kaleb-himes/RIOT,EmuxEvans/RIOT,OlegHahm/RIOT,shady33/RIOT,immesys/RiSyn,Josar/RIOT,katezilla/RIOT,luciotorre/RIOT,attdona/RIOT,beurdouche/RIOT,dkm/RIOT,neumodisch/RIOT,ntrtrung/RIOT,lebrush/RIOT,d00616/RIOT,sgso/RIOT,ThanhVic/RIOT,bartfaizoltan/RIOT,binarylemon/RIOT,MohmadAyman/RIOT,herrfz/RIOT,RIOT-OS/RIOT,koenning/RIOT,ThanhVic/RIOT,wentaoshang/RIOT,plushvoxel/RIOT,MonsterCode8000/RIOT,openkosmosorg/RIOT,authmillenon/RIOT,miri64/RIOT,adrianghc/RIOT,immesys/RiSyn,mfrey/RIOT,altairpearl/RIOT,lazytech-org/RIOT,rajma996/RIOT,chris-wood/RIOT,TobiasFredersdorf/RIOT,gautric/RIOT,beurdouche/RIOT,gautric/RIOT,backenklee/RIOT,MarkXYang/RIOT,automote/RIOT,haoyangyu/RIOT,arvindpdmn/RIOT,marcosalm/RIOT,kerneltask/RIOT,rousselk/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,ximus/RIOT,backenklee/RIOT,LudwigKnuepfer/RIOT,hamilton-mote/RIOT-OS,MarkXYang/RIOT,Ell-i/RIOT,kushalsingh007/RIOT,mfrey/RIOT,msolters/RIOT,kushalsingh007/RIOT,neiljay/RIOT,alignan/RIOT,kaspar030/RIOT,x3ro/RIOT,OTAkeys/RIOT,ks156/RIOT,MonsterCode8000/RIOT,jferreir/RIOT,miri64/RIOT,rakendrathapa/RIOT,A-Paul/RIOT,koenning/RIOT,PSHIVANI/Riot-Code,latsku/RIOT,jfischer-phytec-iot/RIOT,RIOT-OS/RIOT,mziegert/RIOT,abp719/RIOT,daniel-k/RIOT,tdautc19841202/RIOT,luciotorre/RIOT,plushvoxel/RIOT,OTAkeys/RIOT,dailab/RIOT,sumanpanchal/RIOT,EmuxEvans/RIOT,herrfz/RIOT,Osblouf/RIOT,mziegert/RIOT,biboc/RIOT,Osblouf/RIOT,RBartz/RIOT,rajma996/RIOT,zhuoshuguo/RIOT,stevenj/RIOT,miri64/RIOT,bartfaizoltan/RIOT,RBartz/RIOT,attdona/RIOT,smlng/RIOT,l3nko/RIOT,authmillenon/RIOT,Yonezawa-T2/RIOT,kYc0o/RIOT,Lexandro92/RIOT-CoAP,watr-li/RIOT,arvindpdmn/RIOT,gautric/RIOT,Hyungsin/RIOT-OS,ks156/RIOT,kerneltask/RIOT,fnack/RIOT,OlegHahm/RIOT,abkam07/RIOT,watr-li/RIOT,rakendrathapa/RIOT,tfar/RIOT,jfischer-phytec-iot/RIOT,dkm/RIOT,haoyangyu/RIOT,immesys/RiSyn,kbumsik/RIOT,Darredevil/RIOT,abp719/RIOT,msolters/RIOT,neumodisch/RIOT,asanka-code/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,zhuoshuguo/RIOT,biboc/RIOT,kerneltask/RIOT,arvindpdmn/RIOT,herrfz/RIOT,adjih/RIOT,adjih/RIOT,ntrtrung/RIOT,avmelnikoff/RIOT,DipSwitch/RIOT,josephnoir/RIOT,jremmert-phytec-iot/RIOT,stevenj/RIOT,EmuxEvans/RIOT,Josar/RIOT,lazytech-org/RIOT,cladmi/RIOT,lebrush/RIOT,mtausig/RIOT,kb2ma/RIOT,asanka-code/RIOT,patkan/RIOT,patkan/RIOT,thomaseichinger/RIOT,kYc0o/RIOT,alex1818/RIOT,adrianghc/RIOT,jasonatran/RIOT,luciotorre/RIOT,jfischer-phytec-iot/RIOT,syin2/RIOT,chris-wood/RIOT,basilfx/RIOT,mziegert/RIOT,rousselk/RIOT,jferreir/RIOT,RBartz/RIOT,tfar/RIOT,lazytech-org/RIOT,jferreir/RIOT,ant9000/RIOT,MohmadAyman/RIOT,abp719/RIOT,dkm/RIOT