* Do not split the brigade if the flush bucket is the last bucket in the brigade.

PR: 23567
Submitted by: Stefan Fritsch <sf sfritsch.de>
Reviewed by: rpluem


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@602735 13f79535-47bb-0310-9956-ffa450edef68