NR RRC - Fix wrong index in used_drbs array

openair2/RRC/NR/rrc_gNB_drbs.c

@@ -119,7 +119,7 @@ uint8_t next_available_drb(gNB_RRC_UE_t *ue, uint8_t pdusession_id, bool is_gbr)
   } else { /* Non-GBR Flow */
     /* Find if Non-GBR DRB exists in the same PDU Session */
     for (drb_id = 0; drb_id < NGAP_MAX_DRBS_PER_UE; drb_id++)
-      if(ue->pduSession[pdusession_id].param.used_drbs[drb_id-1] == DRB_ACTIVE_NONGBR)
+      if(ue->pduSession[pdusession_id].param.used_drbs[drb_id] == DRB_ACTIVE_NONGBR)
         return drb_id+1;
     /* If a Non-GBR DRB does not exist in the same PDU Session, find an available DRB  */
     for (drb_id = 0; drb_id < NGAP_MAX_DRBS_PER_UE; drb_id++)