Get rid of NULLs in fpdfsdk/

fpdfsdk/fsdk_rendercontext.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 "fpdfsdk/include/fsdk_rendercontext.h"
 
 #include "core/fpdfapi/fpdf_render/include/cpdf_renderoptions.h"
 #include "core/fxge/include/fx_ge.h"
 
 void CRenderContext::Clear() {
-  m_pDevice = NULL;
-  m_pContext = NULL;
-  m_pRenderer = NULL;
-  m_pAnnots = NULL;
-  m_pOptions = NULL;
+  m_pDevice = nullptr;
+  m_pContext = nullptr;
+  m_pRenderer = nullptr;
+  m_pAnnots = nullptr;
+  m_pOptions = nullptr;
 }
 
 CRenderContext::~CRenderContext() {
   delete m_pRenderer;
   delete m_pContext;
   delete m_pDevice;
   delete m_pAnnots;
   delete m_pOptions->m_pOCContext;
   delete m_pOptions;
 }
 
 IFSDK_PAUSE_Adapter::IFSDK_PAUSE_Adapter(IFSDK_PAUSE* IPause) {
   m_IPause = IPause;
 }
 
 IFSDK_PAUSE_Adapter::~IFSDK_PAUSE_Adapter() {}
 
 FX_BOOL IFSDK_PAUSE_Adapter::NeedToPauseNow() {
   return m_IPause->NeedToPauseNow && m_IPause->NeedToPauseNow(m_IPause);
 }