windows: Fix a few things clang complains about.

base/process_util_win.cc

 // Copyright (c) 2011 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/process_util.h"
 
 #include <fcntl.h>
 #include <io.h>
 #include <windows.h>
 #include <userenv.h>
@@ skipping 574 matching lines @@
 }
 
 bool WaitForProcessesToExit(const std::wstring& executable_name,
                             int64 wait_milliseconds,
                             const ProcessFilter* filter) {
   const ProcessEntry* entry;
   bool result = true;
   DWORD start_time = GetTickCount();
 
   NamedProcessIterator iter(executable_name, filter);
-  while (entry = iter.NextProcessEntry()) {
+  while ((entry = iter.NextProcessEntry()) != NULL) {
     DWORD remaining_wait =
         std::max<int64>(0, wait_milliseconds - (GetTickCount() - start_time));
     HANDLE process = OpenProcess(SYNCHRONIZE,
                                  FALSE,
                                  entry->th32ProcessID);
     DWORD wait_result = WaitForSingleObject(process, remaining_wait);
     CloseHandle(process);
     result = result && (wait_result == WAIT_OBJECT_0);
   }
 
@@ skipping 384 matching lines @@
 
   PERFORMANCE_INFORMATION info;
   if (!InternalGetPerformanceInfo(&info, sizeof(info))) {
     DLOG(ERROR) << "Failed to fetch internal performance info.";
     return 0;
   }
   return (info.CommitTotal * system_info.dwPageSize) / 1024;
 }
 
 }  // namespace base