fix misplaced bracket causing compilation error when probing is deactivated (RPL_WITH_PROBING=0)
fix misplaced bracket causing compilation error when probing is deactivated (RPL_WITH_PROBING=0)

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