Don't attempt to hold all of the response until we're done. We'll pass data on

when the zlib buffer becomes full and we need to reset the buffer anyway.

Also, tidy up a similar semantic when we see the EOS by returning an error if
ap_pass_brigade gets an error (we'd lose it otherwise).

Reviewed by:	Sander Striker, Andre Malo


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@100806 13f79535-47bb-0310-9956-ffa450edef68