Correct jack_port_get_connections function (should return NULL when no connections).

git-svn-id: http://subversion.jackaudio.org/jack/jack2/trunk/jackmp@1947 0c269be4-1314-0410-8aa9-9f06e86f4224

ChangeLog

@@ -25,6 +25,7 @@ Nedko Arnaudov
 	* Correct jack_client_open_aux, jack_client_open and jack_client_new.
 	* Correct jack_internal_client_load for wrapper layer.
 	* In thread model, execute a dummy cycle to be sure thread has the correct properties (ensure thread creation is finished).
+	* Correct jack_port_get_connections function (should return NULL when no connections).
 
 2008-03-10 Stephane Letz  <letz@grame.fr>
 		

common/JackGraphManager.cpp

@@ -704,7 +704,12 @@ const char** JackGraphManager::GetConnections(jack_port_id_t port_index)
         next_index = GetCurrentIndex();
     } while (cur_index != next_index); // Until a coherent state has been read
 
-    return res;
+	if (res[0]) {	// at least one connection
+		return res;
+	} else {		// empty array, should return NULL
+		free(res);
+		return NULL;
+	}
 }
 
 // Client