fix compare_to_expectations command line launch

gm/rebaseline_server/compare_to_expectations.py

 #!/usr/bin/python
 
 """
 Copyright 2013 Google Inc.
 
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 
 Repackage expected/actual GM results as needed by our HTML rebaseline viewer.
 """
@@ skipping 448 matching lines @@
     }
 
 
 def main():
   logging.basicConfig(format='%(asctime)s %(levelname)s %(message)s',
                       datefmt='%m/%d/%Y %H:%M:%S',
                       level=logging.INFO)
   parser = argparse.ArgumentParser()
   parser.add_argument(
       '--actuals', default=DEFAULT_ACTUALS_DIR,
-      help='Directory containing all actual-result JSON files')
+      help='Directory containing all actual-result JSON files; defaults to '
+      '\'%(default)s\' .')
   parser.add_argument(
       '--expectations', default=DEFAULT_EXPECTATIONS_DIR,
       help='Directory containing all expected-result JSON files; defaults to '
       '\'%(default)s\' .')
   parser.add_argument(
       '--outfile', required=True,
       help='File to write result summary into, in JSON format.')
   parser.add_argument(
       '--results', default=results.KEY__HEADER__RESULTS_FAILURES,
       help='Which result types to include. Defaults to \'%(default)s\'; '
       'must be one of ' +
       str([results.KEY__HEADER__RESULTS_FAILURES,
            results.KEY__HEADER__RESULTS_ALL]))
   parser.add_argument(
       '--workdir', default=DEFAULT_GENERATED_IMAGES_ROOT,
       help='Directory within which to download images and generate diffs; '
       'defaults to \'%(default)s\' .')
   args = parser.parse_args()
-  results = Results(actuals_root=args.actuals,
-                    expected_root=args.expectations,
-                    generated_images_root=args.workdir)
+  results_obj = Results(actuals_root=args.actuals,
+                        expected_root=args.expectations,
+                        generated_images_root=args.workdir)
   gm_json.WriteToFile(
-      results.get_packaged_results_of_type(results_type=args.results),
+      results_obj.get_packaged_results_of_type(results_type=args.results),
       args.outfile)
 
 
 if __name__ == '__main__':
   main()