gdbus: Close private connection if setup fails

Private connection should be properly closed with dbus_connection_close
otherwise libdbus exits with the following error:

  'The last reference on a connection was dropped without closing the
   connection. This is a bug in an application. See
   dbus_connection_unref() documentation for details. Most likely, the
   application was supposed to call dbus_connection_close(), since this
   is a private connection.'
1 file changed