Rename two 'subpool' variables to 'iterpool'. Avoid extra variable by using
standard apr helper function. No functional changes.

* subversion/mod_dav_svn/reports/file-revs.c
  (file_rev_handler): Rename variable.

* subversion/mod_dav_svn/reports/get-locks.c
  (send_get_lock_response): Rename variable. Remove unneeded intermediate
    variable.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1643801 13f79535-47bb-0310-9956-ffa450edef68