mod_proxy_connect: avoid segfault on DNS lookup failure.

PR: 40756
Submitted by: Trevin Beattie <tbeattie boingo.com>

Reviewed by: Nick Kew, Ruediger Pluem, Jim Jagielski, Roy Fielding

Please don't dick with the whitespace while holding up a segfault fix.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@571899 13f79535-47bb-0310-9956-ffa450edef68