dbus-proxy: Don't clear dbus_address twice

It's sufficient to g_free it, which we do further down finalize().
This is not a double-free, because we used g_clear_pointer(),
but it's redundant.

Signed-off-by: Simon McVittie <smcv@collabora.com>

dbus-proxy/flatpak-proxy.c

@@ -487,7 +487,6 @@ flatpak_proxy_finalize (GObject *object)
   if (g_socket_service_is_active (G_SOCKET_SERVICE (proxy)))
     unlink (proxy->socket_path);
 
-  g_clear_pointer (&proxy->dbus_address, g_free);
   g_assert (proxy->clients == NULL);
 
   g_hash_table_destroy (proxy->policy);