Don't access the level after removing the node, since that may kill the

Don't access the level after removing the node, since that may kill the

Mon Feb  2 23:41:48 2004  Matthias Clasen  <maclas@gmx.de>

	* gtk/gtktreemodelfilter.c (gtk_tree_model_filter_row_changed):
	Don't access the level after removing the node, since that may
	kill the level.  (#132615, Crispin Flowerday)