Fix conversion from float to int so that we don't get skew in the int =>

Fix conversion from float to int so that we don't get skew in the int =>

Sun Aug  5 11:24:27 2001  Owen Taylor  <otaylor@redhat.com>

	* gtk/gtkcolorsel.c (gtk_color_selection_set_current_alpha):
	Fix conversion from float to int so that we don't get
	skew in the int => float => int roundtrip.
	(#58120, reported by Vitaly Tishkov). Also fix problem
	where if no alpha was set, the returned alpha
	from (say) set_current_alpha() was returned as 1, not 65535.