Setting lr = NULL on line 399 leads the the loop

closing early (see line 343) and the ap_listeners list being
nonsense.

End result is a segfault if something is already listening on ::
on our port when httpd is started.

Submitted by:	Colm MacCarthaigh <colm@stdlib.net>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@101338 13f79535-47bb-0310-9956-ffa450edef68