Get rid of NULLs in xfa/fxbarcode/

xfa/fxbarcode/qrcode/BC_QRCoder.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 "xfa/fxbarcode/common/BC_CommonByteMatrix.h"
 #include "xfa/fxbarcode/qrcode/BC_QRCoder.h"
 #include "xfa/fxbarcode/qrcode/BC_QRCoderErrorCorrectionLevel.h"
 #include "xfa/fxbarcode/qrcode/BC_QRCoderMode.h"
 #include "xfa/fxbarcode/utils.h"
 
 CBC_QRCoder::CBC_QRCoder() {
-  m_mode = NULL;
-  m_ecLevel = NULL;
+  m_mode = nullptr;
+  m_ecLevel = nullptr;
   m_version = -1;
   m_matrixWidth = -1;
   m_maskPattern = -1;
   m_numTotalBytes = -1;
   m_numDataBytes = -1;
   m_numECBytes = -1;
   m_numRSBlocks = -1;
-  m_matrix = NULL;
+  m_matrix = nullptr;
 }
 CBC_QRCoder::~CBC_QRCoder() {
   delete m_matrix;
 }
 CBC_QRCoderMode* CBC_QRCoder::GetMode() {
   return m_mode;
 }
 CBC_QRCoderErrorCorrectionLevel* CBC_QRCoder::GetECLevel() {
   return m_ecLevel;
 }
@@ skipping 65 matching lines @@
 void CBC_QRCoder::SetNumECBytes(int32_t value) {
   m_numECBytes = value;
 }
 FX_BOOL CBC_QRCoder::IsValidMaskPattern(int32_t maskPattern) {
   return maskPattern >= 0 && maskPattern < NUM_MASK_PATTERNS;
 }
 void CBC_QRCoder::SetMatrix(CBC_CommonByteMatrix* value) {
   m_matrix = value;
 }
 const int32_t CBC_QRCoder::NUM_MASK_PATTERNS = 8;