Cosmetic.

* subversion/libsvn_repos/commit.c
  (check_cntrl): Rename to...
  (check_valid_path): ...this.
  (add_file_or_directory): Move comment to function check_valid_path().


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1461810 13f79535-47bb-0310-9956-ffa450edef68