Fix return value calculation in APXS' error messages.

This should avoid the confusion on APXS errors.
Tz... seems I was on crack when I originally coded this ;)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@84682 13f79535-47bb-0310-9956-ffa450edef68