freetdm: Added sigmsg->call_priv member that contains caller_data.priv originally set by user

libs/freetdm/src/ftdm_io.c

@@ -5504,6 +5504,7 @@ FT_DECLARE(ftdm_status_t) ftdm_span_send_signal(ftdm_span_t *span, ftdm_sigmsg_t
 		sigmsg->chan_id = sigmsg->channel->chan_id;
 		sigmsg->span_id = sigmsg->channel->span_id;
 		sigmsg->call_id = sigmsg->channel->caller_data.call_id;
+		sigmsg->call_priv = sigmsg->channel->caller_data.priv;
 	}
 	
 	/* some core things to do on special events */

libs/freetdm/src/include/freetdm.h

@@ -554,6 +554,7 @@ struct ftdm_sigmsg {
 	uint32_t chan_id; /*!< easy access to chan id */
 	uint32_t span_id; /*!< easy access to span_id */
 	uint32_t call_id; /*!< unique call id for this call */
+	void *call_priv; /*!< Private data for the FreeTDM user from ftdm_caller_data->priv */
 	union {
 		ftdm_event_sigstatus_t sigstatus; /*!< valid if event_id is FTDM_SIGEVENT_SIGSTATUS_CHANGED */
 		ftdm_event_trace_t trace;	/*!< valid if event_id is FTDM_SIGEVENT_TRACE or FTDM_SIGEVENT_TRACE_RAW */