Grab r1090634 from trunk:

don't try to shut down child if it wasn't created
(or, fix warning about reference to uninitialized variable
child_exit_event)

Reviewed by: wrowe, covener


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1100211 13f79535-47bb-0310-9956-ffa450edef68