x2: bug fixes

- free correctly in rrc_eNB_free_mem_UE_context
- check for existence of ue_context.handover_info in rrc_enb_process_itti_msg
- check return value sctp_peeloff in sctp_handle_new_association_req_multi
  and exit in case of failure

openair3/SCTP/sctp_eNB_task.c

@@ -324,7 +324,12 @@ sctp_handle_new_association_req_multi(
         }
     }
 
-    ns = sctp_peeloff(sd,assoc_id);
+    ns = sctp_peeloff(sd, assoc_id);
+    if (ns == -1) {
+      perror("sctp_peeloff");
+      printf("sctp_peeloff: sd=%d assoc_id=%d\n", sd, assoc_id);
+      exit(1);
+    }
 
     sctp_cnx = calloc(1, sizeof(*sctp_cnx));