cpu/nrf51: Updated i2c_release()
cpu/nrf51: Updated i2c_release()

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