Fix memory leak in handling of request bodies during reverse

proxy operations.

PR:      24991
Submitted by: Larry Toppi <larry.toppi citrix.com>
Reviewed by:  Jeff Trawick


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@102017 13f79535-47bb-0310-9956-ffa450edef68