clang/win: Fix build after https://codereview.chromium.org/1496093002

chrome/installer/mini_installer/mini_installer.cc

 // 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.
 
 // mini_installer.exe is the first exe that is run when chrome is being
 // installed or upgraded. It is designed to be extremely small (~5KB with no
 // extra resources linked) and it has two main jobs:
 //   1) unpack the resources (possibly decompressing some)
 //   2) run the real installer (setup.exe) with appropriate flags.
 //
@@ skipping 548 matching lines @@
 
 // Retrieves the SID of the default owner for objects created by this user
 // token (accounting for different behavior under UAC elevation, etc.).
 // NOTE: On success the |sid| parameter must be freed with LocalFree().
 bool GetCurrentOwnerSid(wchar_t** sid) {
   HANDLE token;
   if (!::OpenProcessToken(::GetCurrentProcess(), TOKEN_QUERY, &token))
     return false;
 
   DWORD size = 0;
-  TOKEN_OWNER* owner = NULL;
   bool result = false;
   // We get the TokenOwner rather than the TokenUser because e.g. under UAC
   // elevation we want the admin to own the directory rather than the user.
-  ::GetTokenInformation(token, TokenOwner, &owner, 0, &size);
+  ::GetTokenInformation(token, TokenOwner, NULL, 0, &size);
   if (size && GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
-    if (owner = reinterpret_cast<TOKEN_OWNER*>(::LocalAlloc(LPTR, size))) {
+    if (TOKEN_OWNER* owner =
+            reinterpret_cast<TOKEN_OWNER*>(::LocalAlloc(LPTR, size))) {
       if (::GetTokenInformation(token, TokenOwner, owner, size, &size))
         result = ::ConvertSidToStringSid(owner->Owner, sid);
       ::LocalFree(owner);
     }
   }
   ::CloseHandle(token);
   return result;
 }
 
 // Populates |sd| suitable for use when creating directories within |path| with
@@ skipping 338 matching lines @@
 #pragma function(memset)
 void* memset(void* dest, int c, size_t count) {
   void* start = dest;
   while (count--) {
     *reinterpret_cast<char*>(dest) = static_cast<char>(c);
     dest = reinterpret_cast<char*>(dest) + 1;
   }
   return start;
 }
 }  // extern "C"