Prevent division by zero exceptions from being thrown,
if they are enabled and calls to xmlXPathInit() are being made.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=52003Signed-off-by: Bernhard Kölbl <besentv@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>