File glib-2.28.7-unref.patch of Package mingw32-glib2

diff -Naur glib-2.28.7/gio/gdbusproxy.c glib-2.28.7.new/gio/gdbusproxy.c
--- glib-2.28.7/gio/gdbusproxy.c	2011-05-21 05:29:24.000000000 +0200
+++ glib-2.28.7.new/gio/gdbusproxy.c	2011-06-29 12:52:53.548164022 +0200
@@ -156,7 +156,8 @@
     g_dbus_connection_signal_unsubscribe (proxy->priv->connection,
                                           proxy->priv->signals_subscriber_id);
 
-  g_object_unref (proxy->priv->connection);
+  if (proxy->priv->connection != NULL)
+    g_object_unref (proxy->priv->connection);
   g_free (proxy->priv->name);
   g_free (proxy->priv->name_owner);
   g_free (proxy->priv->object_path);