Get rid of NULLs in xfa/fxbarcode/

xfa/fxbarcode/common/reedsolomon/BC_ReedSolomon.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 26 matching lines @@
                                                                  int32_t& e) {
   if (degree >= m_cachedGenerators.GetSize()) {
     CBC_ReedSolomonGF256Poly* lastGenerator =
         m_cachedGenerators[m_cachedGenerators.GetSize() - 1];
     for (int32_t d = m_cachedGenerators.GetSize(); d <= degree; d++) {
       CFX_Int32Array temp;
       temp.Add(1);
       temp.Add(m_field->Exp(d - 1));
       CBC_ReedSolomonGF256Poly temp_poly;
       temp_poly.Init(m_field, &temp, e);
-      BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+      BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
       CBC_ReedSolomonGF256Poly* nextGenerator =
           lastGenerator->Multiply(&temp_poly, e);
-      BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+      BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
       m_cachedGenerators.Add(nextGenerator);
       lastGenerator = nextGenerator;
     }
   }
   return m_cachedGenerators[degree];
 }
 void CBC_ReedSolomonEncoder::Encode(CFX_Int32Array* toEncode,
                                     int32_t ecBytes,
                                     int32_t& e) {
   if (ecBytes == 0) {
@@ skipping 32 matching lines @@
         coefficients->operator[](y);
   }
   for (int32_t k = 0; k < temp->GetSize(); k++) {
     delete (*temp)[k];
   }
 }
 CBC_ReedSolomonEncoder::~CBC_ReedSolomonEncoder() {
   for (int32_t i = 0; i < m_cachedGenerators.GetSize(); i++)
     delete m_cachedGenerators[i];
 }