mod_deflate:

Don't fail when asked to flush inflated data to the user-agent and that
coincides with the end of stream ("Zlib error flushing inflate buffer").
PR 56196.

Submitted By: [Christoph Fausak <christoph.fausak glueckkanja com>]
Committed By: ylavic


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1572896 13f79535-47bb-0310-9956-ffa450edef68