Allow branch name to be the same as directory name for "git cl diff"

git_cl.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Copyright (C) 2008 Evan Martin <martine@danga.com>
 
 """A git-command for integrating reviews on Rietveld."""
 
 from distutils.version import LooseVersion
@@ skipping 2767 matching lines @@
   base_branch = cl.GetCommonAncestorWithUpstream()
 
   # Create a new branch based on the merge-base
   RunGit(['checkout', '-q', '-b', TMP_BRANCH, base_branch])
   try:
     # Patch in the latest changes from rietveld.
     rtn = PatchIssue(issue, False, False, None)
     if rtn != 0:
       return rtn
 
-    # Switch back to starting brand and diff against the temporary
+    # Switch back to starting branch and diff against the temporary
     # branch containing the latest rietveld patch.
-    subprocess2.check_call(['git', 'diff', TMP_BRANCH, branch])
+    subprocess2.check_call(['git', 'diff', TMP_BRANCH, branch, '--'])
   finally:
     RunGit(['checkout', '-q', branch])
     RunGit(['branch', '-D', TMP_BRANCH])
 
   return 0
 
 
 def CMDowners(parser, args):
   """interactively find the owners for reviewing"""
   parser.add_option(
@@ skipping 173 matching lines @@
         ('AppEngine is misbehaving and returned HTTP %d, again. Keep faith '
           'and retry or visit go/isgaeup.\n%s') % (e.code, str(e)))
 
 
 if __name__ == '__main__':
   # These affect sys.stdout so do it outside of main() to simplify mocks in
   # unit testing.
   fix_encoding.fix_encoding()
   colorama.init()
   sys.exit(main(sys.argv[1:]))