core: Fix assert printf format string
core: Fix assert printf format string

cppcheck said: core/assert.c:23: warning (invalidPrintfArgType_sint): %d in
format string (no. 2) requires 'int' but the argument type is 'unsigned
int'.

cladmi/RIOT,smlng/RIOT,yogo1212/RIOT,roberthartung/RIOT,dkm/RIOT,dailab/RIOT,Hyungsin/RIOT-OS,LudwigOrtmann/RIOT,kaleb-himes/RIOT,OTAkeys/RIOT,mtausig/RIOT,OTAkeys/RIOT,RIOT-OS/RIOT,LudwigOrtmann/RIOT,roberthartung/RIOT,OlegHahm/RIOT,jbeyerstedt/RIOT-OTA-update,avmelnikoff/RIOT,aeneby/RIOT,yogo1212/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,kerneltask/RIOT,yogo1212/RIOT,TobiasFredersdorf/RIOT,beurdouche/RIOT,beurdouche/RIOT,neiljay/RIOT,authmillenon/RIOT,neiljay/RIOT,smlng/RIOT,LudwigKnuepfer/RIOT,ant9000/RIOT,lazytech-org/RIOT,lazytech-org/RIOT,adjih/RIOT,basilfx/RIOT,TobiasFredersdorf/RIOT,ks156/RIOT,basilfx/RIOT,mfrey/RIOT,kaleb-himes/RIOT,adrianghc/RIOT,roberthartung/RIOT,kaspar030/RIOT,immesys/RiSyn,basilfx/RIOT,A-Paul/RIOT,hamilton-mote/RIOT-OS,neumodisch/RIOT,josephnoir/RIOT,LudwigOrtmann/RIOT,toonst/RIOT,x3ro/RIOT,lazytech-org/RIOT,yogo1212/RIOT,LudwigKnuepfer/RIOT,jasonatran/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,OlegHahm/RIOT,ant9000/RIOT,mfrey/RIOT,gebart/RIOT,BytesGalore/RIOT,Josar/RIOT,jfischer-phytec-iot/RIOT,immesys/RiSyn,kbumsik/RIOT,kaspar030/RIOT,biboc/RIOT,neumodisch/RIOT,beurdouche/RIOT,RIOT-OS/RIOT,thomaseichinger/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,authmillenon/RIOT,kbumsik/RIOT,neumodisch/RIOT,Hyungsin/RIOT-OS,smlng/RIOT,kYc0o/RIOT,hamilton-mote/RIOT-OS,A-Paul/RIOT,jbeyerstedt/RIOT-OTA-update,dkm/RIOT,ks156/RIOT,plushvoxel/RIOT,kaspar030/RIOT,josephnoir/RIOT,LudwigOrtmann/RIOT,beurdouche/RIOT,mfrey/RIOT,kYc0o/RIOT,biboc/RIOT,dailab/RIOT,authmillenon/RIOT,adrianghc/RIOT,Hyungsin/RIOT-OS,jasonatran/RIOT,authmillenon/RIOT,immesys/RiSyn,neiljay/RIOT,jbeyerstedt/RIOT-OTA-update,dkm/RIOT,josephnoir/RIOT,ant9000/RIOT,Ell-i/RIOT,biboc/RIOT,ant9000/RIOT,ks156/RIOT,kbumsik/RIOT,adrianghc/RIOT,jfischer-phytec-iot/RIOT,adrianghc/RIOT,toonst/RIOT,gautric/RIOT,mfrey/RIOT,plushvoxel/RIOT,neiljay/RIOT,neumodisch/RIOT,adjih/RIOT,kaspar030/RIOT,kbumsik/RIOT,plushvoxel/RIOT,Josar/RIOT,gautric/RIOT,LudwigKnuepfer/RIOT,hamilton-mote/RIOT-OS,BytesGalore/RIOT,miri64/RIOT,x3ro/RIOT,gautric/RIOT,adrianghc/RIOT,smlng/RIOT,jfischer-phytec-iot/RIOT,BytesGalore/RIOT,mtausig/RIOT,kaleb-himes/RIOT,josephnoir/RIOT,Josar/RIOT,kerneltask/RIOT,RIOT-OS/RIOT,LudwigOrtmann/RIOT,rfuentess/RIOT,aeneby/RIOT,kaleb-himes/RIOT,mfrey/RIOT,kYc0o/RIOT,thomaseichinger/RIOT,syin2/RIOT,roberthartung/RIOT,kbumsik/RIOT,cladmi/RIOT,biboc/RIOT,gebart/RIOT,immesys/RiSyn,gebart/RIOT,x3ro/RIOT,rfuentess/RIOT,cladmi/RIOT,hamilton-mote/RIOT-OS,avmelnikoff/RIOT,dkm/RIOT,OlegHahm/RIOT,hamilton-mote/RIOT-OS,thomaseichinger/RIOT,OlegHahm/RIOT,plushvoxel/RIOT,Hyungsin/RIOT-OS,lazytech-org/RIOT,dailab/RIOT,immesys/RiSyn,Ell-i/RIOT,mtausig/RIOT,RIOT-OS/RIOT,kaspar030/RIOT,x3ro/RIOT,Hyungsin/RIOT-OS,gebart/RIOT,ant9000/RIOT,BytesGalore/RIOT,avmelnikoff/RIOT,toonst/RIOT,A-Paul/RIOT,thomaseichinger/RIOT,A-Paul/RIOT,authmillenon/RIOT,beurdouche/RIOT,syin2/RIOT,smlng/RIOT,TobiasFredersdorf/RIOT,Ell-i/RIOT,syin2/RIOT,neumodisch/RIOT,OTAkeys/RIOT,dailab/RIOT,cladmi/RIOT,authmillenon/RIOT,yogo1212/RIOT,josephnoir/RIOT,A-Paul/RIOT,jbeyerstedt/RIOT-OTA-update,jfischer-phytec-iot/RIOT,gautric/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,gebart/RIOT,avmelnikoff/RIOT,aeneby/RIOT,kaleb-himes/RIOT,basilfx/RIOT,TobiasFredersdorf/RIOT,jfischer-phytec-iot/RIOT,roberthartung/RIOT,jasonatran/RIOT,BytesGalore/RIOT,adjih/RIOT,TobiasFredersdorf/RIOT,kYc0o/RIOT,rfuentess/RIOT,syin2/RIOT,miri64/RIOT,RIOT-OS/RIOT,avmelnikoff/RIOT,OTAkeys/RIOT,lazytech-org/RIOT,kerneltask/RIOT,mtausig/RIOT,miri64/RIOT,syin2/RIOT,toonst/RIOT,Ell-i/RIOT,jasonatran/RIOT,ks156/RIOT,Josar/RIOT,kYc0o/RIOT,x3ro/RIOT,jasonatran/RIOT,neiljay/RIOT,LudwigKnuepfer/RIOT,thomaseichinger/RIOT,mtausig/RIOT,plushvoxel/RIOT,basilfx/RIOT,LudwigKnuepfer/RIOT,jbeyerstedt/RIOT-OTA-update,miri64/RIOT,cladmi/RIOT,rfuentess/RIOT,LudwigOrtmann/RIOT,Ell-i/RIOT,toonst/RIOT,yogo1212/RIOT,kerneltask/RIOT,aeneby/RIOT,OTAkeys/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,ks156/RIOT,aeneby/RIOT,adjih/RIOT,adjih/RIOT,kerneltask/RIOT,dailab/RIOT,dkm/RIOT,biboc/RIOT,neumodisch/RIOT,miri64/RIOT,rfuentess/RIOT,OlegHahm/RIOT,immesys/RiSyn,gautric/RIOT,Josar/RIOT