- These flags are not for apr_dir_ function. Clarify comment.
- Initialize 'depth', especially when AP_DIR_FLAG_RECURSIVE is explicitelly required.
- Avoid an harmless over-allocation .
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1853302 13f79535-47bb-0310-9956-ffa450edef68