Fix C-L filter non-blocking-mode brokenness. It was failing to ever

read from pipe/socket buckets again if it got APR_EAGAIN from them
due to its use of APR_BRIGADE_FOREACH.

Submitted by: the gang on IRC


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@95946 13f79535-47bb-0310-9956-ffa450edef68