fix an infinite loop in proxy CONNECT

(problem was only in 2.1-dev)

Submitted by:	jean-frederic clere <jfrederic.clere fujitsu-siemens.com>
Reviewed by:	Jeff Trawick


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@104683 13f79535-47bb-0310-9956-ffa450edef68