Get rid of NULLs in xfa/fxbarcode/

xfa/fxbarcode/common/BC_CommonByteMatrix.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 2008 ZXing authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 
 #include "core/fxcrt/include/fx_memory.h"
 #include "xfa/fxbarcode/common/BC_CommonByteMatrix.h"
 
 CBC_CommonByteMatrix::CBC_CommonByteMatrix(int32_t width, int32_t height) {
   m_height = height;
   m_width = width;
-  m_bytes = NULL;
+  m_bytes = nullptr;
 }
 void CBC_CommonByteMatrix::Init() {
   m_bytes = FX_Alloc2D(uint8_t, m_height, m_width);
   FXSYS_memset(m_bytes, 0xff, m_height * m_width);
 }
 CBC_CommonByteMatrix::~CBC_CommonByteMatrix() {
   FX_Free(m_bytes);
 }
 int32_t CBC_CommonByteMatrix::GetHeight() {
   return m_height;
@@ skipping 15 matching lines @@
   for (y = 0; y < m_height; y++) {
     int32_t x;
     for (x = 0; x < m_width; x++) {
       m_bytes[y * m_width + x] = value;
     }
   }
 }
 uint8_t* CBC_CommonByteMatrix::GetArray() {
   return m_bytes;
 }