tests/periph_cpuid: check if correct number of bytes was printed
tests/periph_cpuid: check if correct number of bytes was printed

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