Merge r1875353 from trunk:

Merge r1875353 from trunk:

* modules/proxy/mod_proxy_http.c (ap_proxy_http_process_response): Clear any
  possible returned buckets in the brigade in the error case. As we want to
  close the connection anyway there is no sensible content we could still
  sent and hence doing the needed life time transformation of the buckets
  would be a waste.

PR: 64234

Submitted by: rpluem
Reviewed by: ylavic, jorton, jfclere

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1887378 13f79535-47bb-0310-9956-ffa450edef68