Follow-up r1606132:

* tools/server-side/svnfsfs/stats-cmd.c
  (read_log_rev_or_packfile): Use a result pool with appropriate lifetime.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1606137 13f79535-47bb-0310-9956-ffa450edef68