Fix a bug in Warn(), simplify code

gcl.py

 #!/usr/bin/python
 # Copyright (c) 2006-2009 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.
 
 """\
 Wrapper script around Rietveld's upload.py that simplifies working with groups
 of files.
 """
 
@@ skipping 166 matching lines @@
       for line in settings_file.splitlines():
         if not line or line.startswith("#"):
           continue
         k, v = line.split(": ", 1)
         CODEREVIEW_SETTINGS[k] = v
     CODEREVIEW_SETTINGS.setdefault('__just_initialized', None)
   return CODEREVIEW_SETTINGS.get(key, "")
 
 
 def Warn(msg):
-  ErrorExit(msg, exit=False)
+  print >> sys.stderr, msg
 
 
-def ErrorExit(msg, do_exit=True):
-  """Print an error message to stderr and optionally exit."""
+def ErrorExit(msg):
   print >> sys.stderr, msg
-  if do_exit:
-    sys.exit(1)
+  sys.exit(1)
 
 
 def RunShellWithReturnCode(command, print_output=False):
   """Executes a command and returns the output and the return code."""
   # Use a shell for subcommands on Windows to get a PATH search, and because svn
   # may be a batch file.
   use_shell = sys.platform.startswith("win")
   p = subprocess.Popen(command, stdout=subprocess.PIPE,
                        stderr=subprocess.STDOUT, shell=use_shell,
                        universal_newlines=True)
@@ skipping 1109 matching lines @@
     argv = ['help']
   command = Command(argv[0])
   if command:
     return command(argv[1:])
   # Unknown command, try to pass that to svn
   return CMDpassthru(argv)
 
 
 if __name__ == "__main__":
   sys.exit(main(sys.argv[1:]))