freetdm: Added some code to differentiate between wanpipe_wait returning…

freetdm: Added some code to differentiate between wanpipe_wait returning FTDM_TIMEOUT and FTDM_FAIL on transmit

libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_stack_rcv.c

@@ -897,12 +897,19 @@ int16_t sngisdn_rcv_l1_data_req(uint16_t spId, sng_l1_frame_t *l1_frame)
 	do {
 		flags = FTDM_WRITE;
 		status = signal_data->dchan->fio->wait(signal_data->dchan, &flags, 1000);
-		if (status != FTDM_SUCCESS) {
-			ftdm_log_chan_msg(signal_data->dchan, FTDM_LOG_WARNING, "transmit timed-out\n");
-			return -1;
+		switch(status) {
+			case FTDM_SUCCESS:
+				break;
+			case FTDM_TIMEOUT:
+				continue;
+			case FTDM_FAIL:
+			default:
+				ftdm_log_chan_msg(signal_data->dchan, FTDM_LOG_WARNING, "failed to poll for channel\n");
+				return -1;
 		}
 		
 		
+		/* status = FTDM_SUCCESS */	
 		if ((flags & FTDM_WRITE)) {
 #if 0
 			int i;