Merge r1373898 from trunk:

Fix crash in packet dump code of mod_proxy_ajp when
logging with LogLevel trace7 or trace8.

PR 53730

Submitted by: rjung
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1390510 13f79535-47bb-0310-9956-ffa450edef68