Fix an access violation caused by incorrect pointer use.

* subversion/libsvn_repos/dump.c
  (verify_directory_entry): the cache returns a pointer to data -
                            not the data directly

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1532866 13f79535-47bb-0310-9956-ffa450edef68