tests/periph_eeprom: fix 'results' type
tests/periph_eeprom: fix 'results' type

Results type should only be an array of char, not an array of pointers.

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