Merge r656400 from trunk:

* Check for failure of apr_file_info_get call

Reported By: BOYA SUN <boya.sun case.edu>

Submitted by: rpluem
Reviewed by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@660934 13f79535-47bb-0310-9956-ffa450edef68