Followup to r1564215: Minor tweaks to variable scope and pool parentage.

* subversion/libsvn_repos/reporter.c
  (delta_dirs): Move iterpool into the if scope since it's not used outside it.
    Make iterpool a child of subpool and avoid an extra svn_pool_destroy()
    call on iterpool.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1564444 13f79535-47bb-0310-9956-ffa450edef68