GtkListStorePrivate: Improve struct packing

gtk/gtkliststore.c

@@ -33,7 +33,6 @@
 
 struct _GtkListStorePrivate
 {
-  GtkSortType order;
   GtkTreeIterCompareFunc default_sort_func;
 
   GDestroyNotify default_sort_destroy;
@@ -45,6 +44,8 @@ struct _GtkListStorePrivate
   gint sort_column_id;
   gint length;
 
+  GtkSortType order;
+
   guint columns_dirty : 1;
 
   gpointer default_sort_data;