Merge r1734006 from trunk:

mod_ssl: Don't lose track of the SSL context if the ssl_run_pre_handshake()
hook returns an error.

Submitted by: minfrin
Reviewed by: minfrin, jim, ylavic
Backported by: ylavic


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1734396 13f79535-47bb-0310-9956-ffa450edef68