periph/i2c: Add precondition on i2c_acquire for i2c bus access
periph/i2c: Add precondition on i2c_acquire for i2c bus access

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