sam0_common: check ADC_NUMOF on adc_init()
sam0_common: check ADC_NUMOF on adc_init()

josephnoir/RIOT,BytesGalore/RIOT,miri64/RIOT,authmillenon/RIOT,basilfx/RIOT,smlng/RIOT,mfrey/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,lazytech-org/RIOT,mtausig/RIOT,toonst/RIOT,mfrey/RIOT,OlegHahm/RIOT,cladmi/RIOT,mfrey/RIOT,miri64/RIOT,cladmi/RIOT,OTAkeys/RIOT,x3ro/RIOT,aeneby/RIOT,kaspar030/RIOT,ant9000/RIOT,A-Paul/RIOT,mtausig/RIOT,kYc0o/RIOT,rfuentess/RIOT,OlegHahm/RIOT,rfuentess/RIOT,mtausig/RIOT,kaspar030/RIOT,ant9000/RIOT,yogo1212/RIOT,authmillenon/RIOT,rfuentess/RIOT,yogo1212/RIOT,authmillenon/RIOT,lazytech-org/RIOT,OTAkeys/RIOT,yogo1212/RIOT,yogo1212/RIOT,aeneby/RIOT,smlng/RIOT,A-Paul/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,authmillenon/RIOT,mtausig/RIOT,BytesGalore/RIOT,cladmi/RIOT,A-Paul/RIOT,toonst/RIOT,basilfx/RIOT,ant9000/RIOT,aeneby/RIOT,lazytech-org/RIOT,ant9000/RIOT,x3ro/RIOT,jasonatran/RIOT,kaspar030/RIOT,basilfx/RIOT,miri64/RIOT,BytesGalore/RIOT,josephnoir/RIOT,toonst/RIOT,smlng/RIOT,jasonatran/RIOT,mfrey/RIOT,x3ro/RIOT,cladmi/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,kYc0o/RIOT,BytesGalore/RIOT,toonst/RIOT,kaspar030/RIOT,OlegHahm/RIOT,authmillenon/RIOT,josephnoir/RIOT,A-Paul/RIOT,ant9000/RIOT,mtausig/RIOT,aeneby/RIOT,josephnoir/RIOT,smlng/RIOT,x3ro/RIOT,kYc0o/RIOT,BytesGalore/RIOT,A-Paul/RIOT,miri64/RIOT,x3ro/RIOT,mfrey/RIOT,basilfx/RIOT,jasonatran/RIOT,lazytech-org/RIOT,yogo1212/RIOT,miri64/RIOT,jasonatran/RIOT,OlegHahm/RIOT,basilfx/RIOT,OTAkeys/RIOT,toonst/RIOT,josephnoir/RIOT,rfuentess/RIOT,cladmi/RIOT,OTAkeys/RIOT,smlng/RIOT,kYc0o/RIOT,kaspar030/RIOT,lazytech-org/RIOT,yogo1212/RIOT,aeneby/RIOT,rfuentess/RIOT