Fix a segfault in ab when run in verbose mode using https.

PR: 46393
Submitted by: Stefan Fritsch <sf sfritsch.de>, Ryan Niebur
Reviewed by: poirier


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@818204 13f79535-47bb-0310-9956-ffa450edef68