Fixes to possible GetLastError bugs

sandbox/win/tools/launcher/launcher.cc

 // Copyright (c) 2006-2008 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.
 
 #include "base/win/scoped_handle.h"
 #include "base/win/scoped_process_information.h"
 #include "base/win/windows_version.h"
 #include "sandbox/win/src/restricted_token_utils.h"
 
 // launcher.exe is an application used to launch another application with a
@@ skipping 84 matching lines @@
                              &temp_process_info)) {
     return ::GetLastError();
   }
   base::win::ScopedProcessInformation process_info(temp_process_info);
 
   // Change the token of the main thread of the new process for the
   // impersonation token with more rights.
   {
     HANDLE temp_thread = process_info.thread_handle();
     if (!::SetThreadToken(&temp_thread, impersonation_token.Get())) {
+      auto last_error = ::GetLastError();
       ::TerminateProcess(process_info.process_handle(),
                          0);  // exit code
-      return ::GetLastError();
+      return last_error;
     }
   }
 
   err_code = job.AssignProcessToJob(process_info.process_handle());
   if (ERROR_SUCCESS != err_code) {
+    auto last_error = ::GetLastError();
     ::TerminateProcess(process_info.process_handle(),
                        0);  // exit code
-    return ::GetLastError();
+    return last_error;
   }
 
   // Start the application
   ::ResumeThread(process_info.thread_handle());
 
   *job_handle = job.Take();
 
   return ERROR_SUCCESS;
 }
 
@@ skipping 133 matching lines @@
     return -1;
   }
 
   wprintf(L"\nPress any key to continue.");
   while(!_kbhit()) {
     Sleep(100);
   }
 
   return 0;
 }