Merge r442758 from trunk:

PR 31759 (mutated) - reported by Jo Rhett
Don't return apr_status_t error value from input filter chain.

Submitted by: niq
Reviewed by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@483980 13f79535-47bb-0310-9956-ffa450edef68