TDESynDaemon: prevent more than one instance from running at the same time

Signed-off-by: Mavridis Philippe <mavridisf@gmail.com>
(cherry picked from commit cc6f1bd569)

kcontrol/input/tdesyndaemon.cpp

@@ -194,7 +194,13 @@ extern "C" TDE_EXPORT int main(int argc, char *argv[])
 
     TDEApplication app;
     app.disableSessionManagement();
+    if (app.dcopClient()->isApplicationRegistered("tdesyndaemon"))
+    {
+        kdWarning() << "TDESynDaemon already running, exiting..." << endl;
+        return 255;
+    }
     app.dcopClient()->registerAs("tdesyndaemon", false);
+    app.dcopClient()->setDefaultObject("tdesyndaemon");
 
     TDESynDaemon tdesyndaemon;
     return app.exec();