Fix compiler warnings.

* tools/dev/fsfs-access-map.c
  (open_file): Use int for cluster_count to match its use for nelts of an APR
    array.
  (write_bitmap): Use int for max_x which is plenty for its use.  Use apr_size_t
    for row_size which is consistent with it's use with APR functions.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1569997 13f79535-47bb-0310-9956-ffa450edef68