Add some sanity checks if the widget passed to gtk_drag_get_data() was not

Add some sanity checks if the widget passed to gtk_drag_get_data() was not

Wed Feb  2 11:58:05 2000  Owen Taylor  <otaylor@redhat.com>

	* gtk/gtkdnd.c (gtk_drag_selection_received): Add some sanity
	checks if the widget passed to gtk_drag_get_data() was not the
	dest widget.