Get rid of most instance of 'foo != NULL'

fpdfsdk/src/pdfwindow/PWL_Wnd.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include <map>
 
 #include "fpdfsdk/include/pdfwindow/PDFWindow.h"
 #include "fpdfsdk/include/pdfwindow/PWL_ScrollBar.h"
 #include "fpdfsdk/include/pdfwindow/PWL_Utils.h"
 #include "fpdfsdk/include/pdfwindow/PWL_Wnd.h"
 
 /* -------------------------- CPWL_Timer -------------------------- */
 
 static std::map<int32_t, CPWL_Timer*>& GetPWLTimeMap() {
   // Leak the object at shutdown.
   static auto timeMap = new std::map<int32_t, CPWL_Timer*>;
   return *timeMap;
 }
 
 CPWL_Timer::CPWL_Timer(CPWL_TimerHandler* pAttached,
                        IFX_SystemHandler* pSystemHandler)
     : m_nTimerID(0), m_pAttached(pAttached), m_pSystemHandler(pSystemHandler) {
-  ASSERT(m_pAttached != NULL);
-  ASSERT(m_pSystemHandler != NULL);
+  ASSERT(m_pAttached);
+  ASSERT(m_pSystemHandler);
 }
 
 CPWL_Timer::~CPWL_Timer() {
   KillPWLTimer();
 }
 
 int32_t CPWL_Timer::SetPWLTimer(int32_t nElapse) {
   if (m_nTimerID != 0)
     KillPWLTimer();
   m_nTimerID = m_pSystemHandler->SetTimer(nElapse, TimerProc);
@@ skipping 1034 matching lines @@
   return FALSE;
 }
 
 FX_BOOL CPWL_Wnd::IsINSERTpressed(FX_DWORD nFlag) const {
   if (IFX_SystemHandler* pSystemHandler = GetSystemHandler()) {
     return pSystemHandler->IsINSERTKeyDown(nFlag);
   }
 
   return FALSE;
 }