Fix for zchan not getting unlocked

git-svn-id: http://svn.openzap.org/svn/openzap/trunk@940 a93c3328-9c30-0410-af19-c9cd2b2d52af

libs/openzap/src/ozmod/ozmod_sangoma_boost/ozmod_sangoma_boost.c

@@ -677,6 +677,7 @@ static void handle_call_stop(zap_span_t *span, sangomabc_connection_t *mcon, san
 						0,
 						SIGBOOST_EVENT_CALL_STOPPED_ACK,
 						0);
+			zap_mutex_unlock(zchan->mutex);
 			return;
 		} else {
 			zap_set_state_r(zchan, ZAP_CHANNEL_STATE_TERMINATING, 0, r);