Unsigned warning fix - take 2

sandbox/src/win_utils_unittest.cc

 // Copyright (c) 2010 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 <windows.h>
 
 #include "sandbox/src/win_utils.h"
 #include "sandbox/tests/common/test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 TEST(WinUtils, IsReparsePoint) {
   using sandbox::IsReparsePoint;
 
   // Create a temp file because we need write access to it.
   wchar_t temp_directory[MAX_PATH];
   wchar_t my_folder[MAX_PATH];
-  ASSERT_NE(::GetTempPath(MAX_PATH, temp_directory), 0);
-  ASSERT_NE(::GetTempFileName(temp_directory, L"test", 0, my_folder), 0);
+  ASSERT_NE(::GetTempPath(MAX_PATH, temp_directory), 0u);
+  ASSERT_NE(::GetTempFileName(temp_directory, L"test", 0, my_folder), 0u);
 
   // Delete the file and create a directory instead.
   ASSERT_TRUE(::DeleteFile(my_folder));
   ASSERT_TRUE(::CreateDirectory(my_folder, NULL));
 
   bool result = true;
   EXPECT_EQ(ERROR_SUCCESS, IsReparsePoint(my_folder, &result));
   EXPECT_FALSE(result);
 
   // We have to fix Bug 32224 to pass this test.
@@ skipping 13 matching lines @@
   std::wstring temp_dir_nt = std::wstring(L"\\??\\") + temp_directory;
   EXPECT_TRUE(SetReparsePoint(dir, temp_dir_nt.c_str()));
 
   EXPECT_EQ(ERROR_SUCCESS, IsReparsePoint(new_file, &result));
   EXPECT_TRUE(result);
 
   EXPECT_TRUE(DeleteReparsePoint(dir));
   EXPECT_TRUE(::CloseHandle(dir));
   EXPECT_TRUE(::RemoveDirectory(my_folder));
 }