Merge r1737014 from trunk:

mod_proxy_express: Fix possible use of DB handle after close.
PR 59230.

Submitted by: Petr <pgajdos suse.cz>
Reviewed by: ylavic, trawick, wrowe



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1737363 13f79535-47bb-0310-9956-ffa450edef68