Merge r1717958 from trunk:

using c->master for ssl var lookups when c holds no valid SSLConnRec. Fixes PR58666.
Submitted by: icing
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1718331 13f79535-47bb-0310-9956-ffa450edef68