report status in return value instead of spewing assertions. (#335729,

report status in return value instead of spewing assertions. (#335729,

2006-06-12  Kristian Rietveld  <kris@gtk.org>

	* gtk/gtktreemodelfilter.[ch]
	(gtk_tree_model_filter_convert_child_iter_to_iter),
	(gtk_tree_model_filter_convert_child_path_to_path): report status
	in return value instead of spewing assertions.  (#335729, Yevgen
	Muntyan).