freetdm: fixing a potential crash on a rarely happened situation

libs/freetdm/src/ftmod/ftmod_sangoma_ss7/ftmod_sangoma_ss7_cli.c

@@ -1314,6 +1314,10 @@ static ftdm_status_t handle_show_status(ftdm_stream_handle_t *stream, int span,
 						}else {
 							stream->write_function(stream, "relay=N");
 						}
+
+#ifdef SMG_RELAY_DBG
+						stream->write_function(stream, "| flag=0x%llx", ftdmchan->flags);
+#endif
 					}
 		
 #ifdef SMG_RELAY_DBG

libs/freetdm/src/ftmod/ftmod_sangoma_ss7/ftmod_sangoma_ss7_main.c

@@ -614,6 +614,7 @@ static void ftdm_sangoma_ss7_process_stack_event (sngss7_event_data_t *sngss7_ev
 			break;
 		case SNGSS7_REL_CFM_EVENT:
 			{
+				if (sngss7_info->peer_data) {
 					ftdm_channel_t *peer_chan = sngss7_info->peer_data->ftdmchan;
 					ftdm_set_state(ftdmchan, FTDM_CHANNEL_STATE_DOWN);
 					if (peer_chan) {
@@ -630,6 +631,7 @@ static void ftdm_sangoma_ss7_process_stack_event (sngss7_event_data_t *sngss7_ev
 						ftdm_channel_lock(ftdmchan);
 					}
 				}
+			}
 			break;
 		default:
 			break;