Fix a NULL variable check in proxy where we were checking the

wrong variable.
PR:
Obtained from:
Submitted by:	Geff Hanoian <geff@pier64.com>
Reviewed by:	Graham Leggett


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@93803 13f79535-47bb-0310-9956-ffa450edef68