cpu/stm32_common/i2c: Fix return error code
cpu/stm32_common/i2c: Fix return error code

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