Fix Coverity Scan CID 21938 (Using uninitialized value status_resp. Field...

Fix Coverity Scan CID 21938 (Using uninitialized value status_resp. Field status_resp.head_sdu_creation_time is uninitialized.)

openair2/LAYER2/RLC/TM_v9.3.0/rlc_tm.c

@@ -161,6 +161,7 @@ rlc_tm_mac_status_indication (
   status_resp.buffer_occupancy_in_bytes = ((rlc_tm_entity_t *) rlc_pP)->buffer_occupancy;
   status_resp.buffer_occupancy_in_pdus = status_resp.buffer_occupancy_in_bytes / ((rlc_tm_entity_t *) rlc_pP)->rlc_pdu_size;
   status_resp.rlc_info.rlc_protocol_state = ((rlc_tm_entity_t *) rlc_pP)->protocol_state;
+  status_resp.head_sdu_creation_time = 0;
   return status_resp;
 }