tests/periph_uart_int: warning fixes
tests/periph_uart_int: warning fixes

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