Merge r1209417 from trunk:

* server/listen.c (open_listeners): Fix logic error caught by
  Coverity; possible NULL pointer deref at startup with a
  particular (and unlikely) listener/system config.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1209439 13f79535-47bb-0310-9956-ffa450edef68