Fix clang-format canned check warning text

presubmit_canned_checks.py

 # 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.
 
 """Generic presubmit checks that can be reused by other presubmit checks."""
 
 import os as _os
 _HERE = _os.path.dirname(_os.path.abspath(__file__))
 
 
@@ skipping 1089 matching lines @@
   return results
 
 
 def CheckPatchFormatted(input_api, output_api):
   import git_cl
   cmd = ['cl', 'format', '--dry-run', input_api.PresubmitLocalPath()]
   code, _ = git_cl.RunGitWithCode(cmd, suppress_stderr=True)
   if code == 2:
     return [output_api.PresubmitPromptWarning(
       'The %s directory requires clang-formatting. '
-      'Please run git cl format %s' % (input_api.basename, input_api.basename))]
+      'Please run git cl format %s' %
+      (input_api.basename(input_api.PresubmitLocalPath()),
+       input_api.basename(input_api.PresubmitLocalPath())))]
   # As this is just a warning, ignore all other errors if the user
   # happens to have a broken clang-format, doesn't use git, etc etc.
   return []