merge r814844 from 2.2.x branch (trunk revs 814652 and 814785):

  *) SECURITY: CVE-2009-3094 (cve.mitre.org)
     mod_proxy_ftp: NULL pointer dereference on error paths.
     [Stefan Fritsch <sf fritsch.de>, Joe Orton]

Reviewed by: pgollucci, poirier, trawick


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.0.x@943925 13f79535-47bb-0310-9956-ffa450edef68