Fix i2c multiple write bug, as reported by Ron Segal: https://sourceforge.net/p/contiki/mailman/message/34633862/
Fix i2c multiple write bug, as reported by Ron Segal: https://sourceforge.net/p/contiki/mailman/message/34633862/

arurke/contiki,MohamedSeliem/contiki,arurke/contiki,arurke/contiki,MohamedSeliem/contiki,arurke/contiki,MohamedSeliem/contiki,arurke/contiki,MohamedSeliem/contiki,MohamedSeliem/contiki,arurke/contiki,arurke/contiki,MohamedSeliem/contiki,MohamedSeliem/contiki