Merge r345686 from trunk:

* Minor performance tweak by reusing already calculated strlen in get_body.

Submitted by: Christophe Jaillet <christophe.jaillet wanadoo.fr>
Reviewed by: Ruediger Pluem


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@345694 13f79535-47bb-0310-9956-ffa450edef68