Print F1AP UE Release Request message after UL failure

Additionally, initialize the F1AP PDU to zeros

openair2/F1AP/f1ap_du_ue_context_management.c

@@ -554,7 +554,7 @@ int DU_send_UE_CONTEXT_SETUP_FAILURE(sctp_assoc_t assoc_id)
 
 int DU_send_UE_CONTEXT_RELEASE_REQUEST(sctp_assoc_t assoc_id, f1ap_ue_context_release_req_t *req)
 {
-  F1AP_F1AP_PDU_t                   pdu;
+  F1AP_F1AP_PDU_t                   pdu = {0};
   F1AP_UEContextReleaseRequest_t    *out;
   uint8_t  *buffer=NULL;
   uint32_t  len=0;

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_primitives.c

@@ -3097,6 +3097,7 @@ void nr_mac_check_ul_failure(const gNB_MAC_INST *nrmac, int rnti, NR_UE_sched_ct
   /* to trigger only once: trigger when ul_failure_timer == 1, but timer will
    * stop at 0 and we wait for a UE release command from upper layers */
   if (sched_ctrl->ul_failure_timer == 1) {
+    LOG_W(MAC, "request release after UL failure timer expiry\n");
     f1_ue_data_t ue_data = du_get_f1_ue_data(rnti);
     f1ap_ue_context_release_req_t request = {
       .gNB_CU_ue_id = ue_data.secondary_ue,