Use g_list_nth_data() instead of g_list_nth()->data in multiple places to

2005-09-19  Matthias Clasen  <mclasen@redhat.com>

	* gtk/gtkiconview.c: Use g_list_nth_data() instead of g_list_nth()->data
	in multiple places to avoid segfaults if the index is out of range.
	(#316422, Guillaume Cottenceau)