Fix undefined default_config_path_bak in gsutil config.

This is already fixed upstream in gsutil.


BUG=None.
TEST=None.

Review URL: https://codereview.chromium.org/341833005

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@280386 0039d316-1c4b-4281-b951-d872f2087c98

third_party/gsutil/gslib/commands/config.py

@@ -594,6 +594,7 @@ class ConfigCommand(Command):
     if not scopes:
       scopes.append(SCOPE_FULL_CONTROL)
 
+    default_config_path_bak = None
     if output_file_name is None:
       # Check to see if a default config file name is requested via
       # environment variable. If so, use it, otherwise use the hard-coded
@@ -607,7 +608,6 @@ class ConfigCommand(Command):
         default_config_path = os.path.expanduser(os.path.join('~', '.boto'))
       if not os.path.exists(default_config_path):
         output_file_name = default_config_path
-        default_config_path_bak = None
       else:
         default_config_path_bak = default_config_path + '.bak'
         if os.path.exists(default_config_path_bak):