cpu/sam3/periph/gpio.c: fix cpp.check shiftTooManyBitsSigned
cpu/sam3/periph/gpio.c: fix cpp.check shiftTooManyBitsSigned

jasonatran/RIOT,RIOT-OS/RIOT,josephnoir/RIOT,authmillenon/RIOT,miri64/RIOT,toonst/RIOT,smlng/RIOT,miri64/RIOT,OlegHahm/RIOT,kaspar030/RIOT,ant9000/RIOT,jasonatran/RIOT,basilfx/RIOT,mtausig/RIOT,mtausig/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,yogo1212/RIOT,mtausig/RIOT,aeneby/RIOT,mtausig/RIOT,yogo1212/RIOT,basilfx/RIOT,x3ro/RIOT,josephnoir/RIOT,OlegHahm/RIOT,authmillenon/RIOT,jasonatran/RIOT,x3ro/RIOT,RIOT-OS/RIOT,ant9000/RIOT,OTAkeys/RIOT,smlng/RIOT,toonst/RIOT,OTAkeys/RIOT,OlegHahm/RIOT,basilfx/RIOT,kYc0o/RIOT,kYc0o/RIOT,miri64/RIOT,kaspar030/RIOT,yogo1212/RIOT,basilfx/RIOT,kaspar030/RIOT,OTAkeys/RIOT,kYc0o/RIOT,kaspar030/RIOT,jasonatran/RIOT,josephnoir/RIOT,jasonatran/RIOT,OTAkeys/RIOT,josephnoir/RIOT,OlegHahm/RIOT,aeneby/RIOT,mtausig/RIOT,authmillenon/RIOT,x3ro/RIOT,toonst/RIOT,RIOT-OS/RIOT,x3ro/RIOT,miri64/RIOT,aeneby/RIOT,smlng/RIOT,toonst/RIOT,RIOT-OS/RIOT,toonst/RIOT,x3ro/RIOT,ant9000/RIOT,ant9000/RIOT,OlegHahm/RIOT,josephnoir/RIOT,smlng/RIOT,ant9000/RIOT,basilfx/RIOT,aeneby/RIOT,yogo1212/RIOT,authmillenon/RIOT,aeneby/RIOT,kYc0o/RIOT,yogo1212/RIOT,kYc0o/RIOT,authmillenon/RIOT,kaspar030/RIOT,authmillenon/RIOT,yogo1212/RIOT,miri64/RIOT,smlng/RIOT