declare exit_status before try

scripts/slave/compile.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """A tool to build chrome, executed by buildbot.
 
   When this is run, the current directory (cwd) should be the outer build
   directory (e.g., chrome-release/build/).
 
@@ skipping 382 matching lines @@
   Args:
       options (Option): options for ninja command.
       args (str): extra args for ninja command.
       env (dict): Used when ninja command executes.
 
   Returns:
       int: ninja command exit status.
 
   """
 
+  exit_status = -1
+
   try:
     print 'chdir to %s' % options.src_dir
     os.chdir(options.src_dir)
 
     command = [options.ninja_path, '-w', 'dupbuild=err',
                                    '-C', options.target_output_dir]
 
     # HACK(yyanagisawa): update environment files on |env| update.
     # For compiling on Windows, environment in environment files are used.
     # It means even if enviroment such as GOMA_DISABLED is updated in
@@ skipping 157 matching lines @@
   exit_status = main_ninja(options, args, env)
 
   # stop goma
   goma_teardown(options, env, exit_status, goma_cloudtail)
 
   return exit_status
 
 
 if '__main__' == __name__:
   sys.exit(real_main())