Fix the print_error parsing, which caused spurious errors on gcl usage.

gclient.py

 #!/usr/bin/python
 #
 # Copyright 2008 Google Inc.  All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #      http://www.apache.org/licenses/LICENSE-2.0
 #
@@ skipping 491 matching lines @@
     The output sent to stdout as a string.
   """
   c = [SVN_COMMAND]
   c.extend(args)
 
   # *Sigh*:  Windows needs shell=True, or else it won't search %PATH% for
   # the svn.exe executable, but shell=True makes subprocess on Linux fail
   # when it's called with a list because it only tries to execute the
   # first string ("svn").
   stderr = None
-  if print_error:
+  if not print_error:
     stderr = subprocess.PIPE
   return subprocess.Popen(c,
                           cwd=in_directory,
                           shell=(sys.platform == 'win32'),
                           stdout=subprocess.PIPE,
                           stderr=stderr).communicate()[0]
 
 
 def RunSVNAndGetFileList(args, in_directory, file_list):
   """Runs svn checkout, update, or status, output to stdout.
@@ skipping 1199 matching lines @@
 
 if "__main__" == __name__:
   try:
     result = Main(sys.argv)
   except Error, e:
     print >> sys.stderr, "Error: %s" % str(e)
     result = 1
   sys.exit(result)
 
 # vim: ts=2:sw=2:tw=80:et: