Fix mistake in crrev.com/650223005.

tools/auto_bisect/source_control.py

 # Copyright 2014 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.
 
 """This module contains functions for performing source control operations."""
 
 import os
 
 import bisect_utils
 
@@ skipping 41 matching lines @@
   log_output = bisect_utils.CheckRunGit(cmd, cwd=cwd)
 
   revision_hash_list = log_output.split()
   revision_hash_list.append(start_revision_hash)
 
   return revision_hash_list
 
 
 def SyncToRevision(revision, sync_client=None):
   if not sync_client:
-    _, return_code = bisect_utils.RunGit(['checkout', revision])[1]
+    _, return_code = bisect_utils.RunGit(['checkout', revision])
   elif sync_client == 'gclient':
     return_code = SyncToRevisionWithGClient(revision)
   elif sync_client == 'repo':
     return_code = SyncToRevisionWithRepo(revision)
   else:
     raise NotImplementedError('Unsupported sync_client: "%s"' % sync_client)
 
   return not return_code
 
 
@@ skipping 181 matching lines @@
       'log',
       '--format=%H',
       '%s~1..%s' % (revision_start, revision_end),
       '--',
       filename,
   ]
   output = bisect_utils.CheckRunGit(cmd)
   lines = output.split('\n')
   return [o for o in lines if o]