pass NULL to gtk_tree_model_rows_reordered and not an iter with user_data

pass NULL to gtk_tree_model_rows_reordered and not an iter with user_data

Wed Jan  9 21:31:44 2002  Kristian Rietveld  <kris@gtk.org>

        * gtk/gtkliststore.c (gtk_list_store_sort): pass NULL to
        gtk_tree_model_rows_reordered and not an iter with user_data
        set to NULL (which is an invalid liststore iter, so
        iter_n_children failed, etc)