cpu/cortexm_common: Fix signedness warning
cpu/cortexm_common: Fix signedness warning

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