Get rid of NULLs in xfa/fxbarcode/

xfa/fxbarcode/qrcode/BC_QRCodeReader.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 2007 ZXing authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ skipping 23 matching lines @@
 #include "xfa/fxbarcode/common/BC_GlobalHistogramBinarizer.h"
 #include "xfa/fxbarcode/common/reedsolomon/BC_ReedSolomonGF256.h"
 #include "xfa/fxbarcode/qrcode/BC_QRCoderDecoder.h"
 #include "xfa/fxbarcode/qrcode/BC_QRCoderErrorCorrectionLevel.h"
 #include "xfa/fxbarcode/qrcode/BC_QRCoderMode.h"
 #include "xfa/fxbarcode/qrcode/BC_QRCoderVersion.h"
 #include "xfa/fxbarcode/qrcode/BC_QRDataMask.h"
 #include "xfa/fxbarcode/qrcode/BC_QRDetector.h"
 #include "xfa/fxbarcode/qrcode/BC_QRDetectorResult.h"
 
-CBC_QRCodeReader::CBC_QRCodeReader() : m_decoder(NULL) {}
+CBC_QRCodeReader::CBC_QRCodeReader() : m_decoder(nullptr) {}
 void CBC_QRCodeReader::Init() {
   m_decoder = new CBC_QRCoderDecoder;
   m_decoder->Init();
 }
 CBC_QRCodeReader::~CBC_QRCodeReader() {
   delete m_decoder;
 }
 CFX_ByteString CBC_QRCodeReader::Decode(CBC_BinaryBitmap* image,
                                         int32_t hints,
                                         int32_t& e) {
@@ skipping 40 matching lines @@
 void CBC_QRCodeReader::ReleaseAll() {
   delete CBC_ReedSolomonGF256::QRCodeFild;
   CBC_ReedSolomonGF256::QRCodeFild = nullptr;
   delete CBC_ReedSolomonGF256::DataMatrixField;
   CBC_ReedSolomonGF256::DataMatrixField = nullptr;
   CBC_QRCoderMode::Destroy();
   CBC_QRCoderErrorCorrectionLevel::Destroy();
   CBC_QRDataMask::Destroy();
   CBC_QRCoderVersion::Destroy();
 }