Get rid of NULLs in xfa/fxbarcode/

xfa/fxbarcode/BC_BinaryBitmap.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
 // Original code is licensed as follows:
 /*
  * Copyright 2009 ZXing authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ skipping 10 matching lines @@
  */
 
 #include "xfa/fxbarcode/BC_Binarizer.h"
 #include "xfa/fxbarcode/BC_BinaryBitmap.h"
 #include "xfa/fxbarcode/BC_LuminanceSource.h"
 #include "xfa/fxbarcode/common/BC_CommonBitArray.h"
 #include "xfa/fxbarcode/common/BC_CommonBitMatrix.h"
 #include "xfa/fxbarcode/utils.h"
 
 CBC_BinaryBitmap::CBC_BinaryBitmap(CBC_Binarizer* binarizer)
-    : m_binarizer(binarizer), m_matrix(NULL) {}
+    : m_binarizer(binarizer), m_matrix(nullptr) {}
 CBC_BinaryBitmap::~CBC_BinaryBitmap() {
   delete m_matrix;
 }
 int32_t CBC_BinaryBitmap::GetHeight() {
   return m_binarizer->GetLuminanceSource()->GetHeight();
 }
 int32_t CBC_BinaryBitmap::GetWidth() {
   return m_binarizer->GetLuminanceSource()->GetWidth();
 }
 CBC_CommonBitMatrix* CBC_BinaryBitmap::GetMatrix(int32_t& e) {
-  if (m_matrix == NULL) {
+  if (!m_matrix) {
     m_matrix = m_binarizer->GetBlackMatrix(e);
-    BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+    BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
   }
   return m_matrix;
 }
 CBC_CommonBitArray* CBC_BinaryBitmap::GetBlackRow(int32_t y,
                                                   CBC_CommonBitArray* row,
                                                   int32_t& e) {
   CBC_CommonBitArray* temp = m_binarizer->GetBlackRow(y, row, e);
-  BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+  BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
   return temp;
 }
 CBC_CommonBitMatrix* CBC_BinaryBitmap::GetBlackMatrix(int32_t& e) {
-  if (m_matrix == NULL) {
+  if (!m_matrix) {
     m_matrix = m_binarizer->GetBlackMatrix(e);
-    BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+    BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
   }
   return m_matrix;
 }