Fix signed-unsigned error that was accidentally causing negative values to

Fix signed-unsigned error that was accidentally causing negative values to

Fri Mar  1 10:31:14 2002  Owen Taylor  <otaylor@redhat.com>

	* gtk/gtknotebook.c (gtk_notebook_reorder_child):
	Fix signed-unsigned error that was accidentally causing
	negative values to append, do it intentionally. Fix docs
	to say that negative values append. (Alexey A. Malyshev,
	#73108)