Correctly pass the issue number as "issue" parameter to Changelist ctor

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."""
 
 import difflib
@@ skipping 1777 matching lines @@
     parser.print_help()
     return 1
   issue_arg = args[0]
 
   # TODO(maruel): Use apply_issue.py
   # TODO(ukai): use gerrit-cherry-pick for gerrit repository?
 
   if issue_arg.isdigit():
     # Input is an issue id.  Figure out the URL.
     issue = int(issue_arg)
-    cl = Changelist(issue)
+    cl = Changelist(issue=issue)
     patchset = cl.GetMostRecentPatchset()
     patch_data = cl.GetPatchSetDiff(issue, patchset)
   else:
     # Assume it's a URL to the patch. Default to https.
     issue_url = gclient_utils.UpgradeToHttps(issue_arg)
     match = re.match(r'.*?/issue(\d+)_(\d+).diff', issue_url)
     if not match:
       DieWithError('Must pass an issue ID or full URL for '
           '\'Download raw patch set\'')
     issue = int(match.group(1))
@@ skipping 425 matching lines @@
   GenUsage(parser, 'help')
   return CMDhelp(parser, argv)
 
 
 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:]))