Trying to tie up some loose ends:

- Return immediately if the return val of ap_pass_brigade != APR_SUCCESS
- Return a bit earlier when dealing with input filters, so as to not build up a huge backlog.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1377685 13f79535-47bb-0310-9956-ffa450edef68