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

core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.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 "render_int.h"
 
 #include <vector>
 
@@ skipping 770 matching lines @@
   if (CPDF_Stream* pStream = ToStream(m_pDict->GetElementValue("Mask")))
     return LoadMaskDIB(pStream);
 
   return nullptr;
 }
 int CPDF_DIBSource::StratLoadMask() {
   m_MatteColor = 0XFFFFFFFF;
   m_pMaskStream = m_pDict->GetStream("SMask");
   if (m_pMaskStream) {
     CPDF_Array* pMatte = m_pMaskStream->GetDict()->GetArray("Matte");
-    if (pMatte != NULL && m_pColorSpace &&
+    if (pMatte && m_pColorSpace &&
         (FX_DWORD)m_pColorSpace->CountComponents() <= m_nComponents) {
       FX_FLOAT R, G, B;
       FX_FLOAT* pColor = FX_Alloc(FX_FLOAT, m_nComponents);
       for (FX_DWORD i = 0; i < m_nComponents; i++) {
         pColor[i] = pMatte->GetFloat(i);
       }
       m_pColorSpace->GetRGB(pColor, R, G, B);
       FX_Free(pColor);
       m_MatteColor = FXARGB_MAKE(0, FXSYS_round(R * 255), FXSYS_round(G * 255),
                                  FXSYS_round(B * 255));
@@ skipping 841 matching lines @@
 }
 FX_BOOL CPDF_ImageLoader::Continue(void* LoadHandle, IFX_Pause* pPause) {
   return ((CPDF_ProgressiveImageLoaderHandle*)LoadHandle)->Continue(pPause);
 }
 CPDF_ImageLoader::~CPDF_ImageLoader() {
   if (!m_bCached) {
     delete m_pBitmap;
     delete m_pMask;
   }
 }