Do not free inside gnb_du_configuration_update_f1ap()

The consumer of this function just passes a pointer to something to be
sent. This function should not free this memory, it's simply not it's
task. This is the same bug as above in
"CU_handle_gNB_DU_CONFIGURATION_UPDATE(): don't free the message of RRC"

openair2/LAYER2/NR_MAC_gNB/mac_rrc_ul_f1ap.c

@@ -82,8 +82,6 @@ static void gnb_du_configuration_update_f1ap(const f1ap_gnb_du_configuration_upd
   f1ap_gnb_du_configuration_update_t cp = cp_f1ap_du_configuration_update(upd);
   /* transfer to ITTI message */
   F1AP_GNB_DU_CONFIGURATION_UPDATE(msg) = cp;
-  /* free after copy */
-  free_f1ap_du_configuration_update(upd);
   /* send to RRC task */
   itti_send_msg_to_task(TASK_DU_F1, 0, msg);
 }