Use ap_assert instead of assert in mod_log_forensic.

This fixes issue #38177.

* src/modules/standard/mod_log_forensic.c
  (log_escape, log_before): s/assert/ap_assert/

Noticed by: Wilson Cheung <wcheung ucsd.edu>
Patch by: Jim Jagielski
Approved by: Jeff Trawick, André Malo


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@367914 13f79535-47bb-0310-9956-ffa450edef68