toplevel g_object_unref segv

[Carlos Romero <caberome bellsouth net>]

this gives a segv in g_datalist_set_data_full()
line:218 if (list->id == key_id)
list = (GData *) 0xaaaaaaaa
intel linux-2.4.17 gcc-2.95.3

GtkWidget* w;
gtk_init (&argc, &argv);
w = gtk_window_new(GTK_WINDOW_TOPLEVEL);
/* w = gtk_invisible_new() */
gtk_widget_show(w);
g_object_unref(G_OBJECT(w));