Merge r417988 from trunk:

* modules/ssl/ssl_engine_init.c (ssl_init_ctx_cleanup_proxy): Unset
pkp->certs pointer after freeing the array; fixes segfault at startup
if the certs are shared across >1 server_rec.

PR: 39915
Submitted by: jorton
Reviewed by: minfrin, rjung, jorton


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@946401 13f79535-47bb-0310-9956-ffa450edef68