Minor code cleanup.

* subversion/svnfsfs/stats-cmd.c
  (read_item): Remove unused parameter.
  (read_log_rev_or_packfile): Update callers.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1632773 13f79535-47bb-0310-9956-ffa450edef68