don't cancel the operations spawned by buttons here,

don't cancel the operations spawned by buttons here,

2006-09-04  Kristian Rietveld  <kris@imendio.com>

	* gtk/gtkpathbar.c (gtk_path_bar_dispose): don't cancel the
	operations spawned by buttons here,
	(set_button_image_get_info_cb): bail out if button is NULL, but
	do free button_data,
	(button_data_free): only free the data is non NULL (since this
	function can be called multiple times for the same data), cancel
	handle is pending but don't free button_data in this case (will
	happen in the callback).