Fix a memory leak in the new directory-caching code.
Fix a memory leak in the new directory-caching code.

* libsvn_fs_fs/fs_fs.c
  (svn_fs_fs__rep_contents_dir): Actually reuse the dir cache pool,
   instead of clearing it and then losing track of it.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion