In the client diff handling, rename the 'path' argument to 'diff_relpath' to
match its function. No functional changes.

* subversion/libsvn_client/diff.c
  (make_repos_relpath,
   display_prop_diffs,
   diff_props_changed,
   diff_dir_props_changed,
   diff_content_changed,
   diff_file_opened,
   diff_file_added,
   diff_file_deleted,
   diff_dir_added,
   diff_dir_deleted,
   diff_dir_opened,
   diff_dir_closed): Rename path argument.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1428337 13f79535-47bb-0310-9956-ffa450edef68