next_filter of NULL to any ap_sub_req_lookup*() fn implies the subreq
  will never be run - or we expect to pass the subreq to fast_redirect.
  The comming fix will break invalid ap_sub_req_lookups* expecting to
  run subrequests with the next_filter NULL semantic.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@93663 13f79535-47bb-0310-9956-ffa450edef68