Get rid of NULLs in xfa/fxbarcode/

xfa/fxbarcode/qrcode/BC_QRDataBlock.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 30 matching lines @@
 CFX_ByteArray* CBC_QRDataBlock::GetCodewords() {
   return m_codewords;
 }
 CFX_ArrayTemplate<CBC_QRDataBlock*>* CBC_QRDataBlock::GetDataBlocks(
     CFX_ByteArray* rawCodewords,
     CBC_QRCoderVersion* version,
     CBC_QRCoderErrorCorrectionLevel* ecLevel,
     int32_t& e) {
   if (rawCodewords->GetSize() != version->GetTotalCodeWords()) {
     e = BCExceptionIllegalArgument;
-    BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+    BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
   }
   CBC_QRCoderECBlocks* ecBlocks = version->GetECBlocksForLevel(ecLevel);
   int32_t totalBlocks = 0;
   CFX_ArrayTemplate<CBC_QRCoderECB*>* ecBlockArray = ecBlocks->GetECBlocks();
   int32_t i = 0;
   for (i = 0; i < ecBlockArray->GetSize(); i++) {
     totalBlocks += (*ecBlockArray)[i]->GetCount();
   }
   std::unique_ptr<CFX_ArrayTemplate<CBC_QRDataBlock*>> result(
       new CFX_ArrayTemplate<CBC_QRDataBlock*>());
@@ skipping 38 matching lines @@
   int32_t max = (*result)[0]->m_codewords->GetSize();
   for (i = shorterBlocksNumDataCodewords; i < max; i++) {
     for (int32_t y = 0; y < numResultBlocks; y++) {
       int32_t iOffset = y < longerBlocksStartAt ? i : i + 1;
       (*((*result)[y]->m_codewords))[iOffset] =
           (*rawCodewords)[rawCodewordsOffset++];
     }
   }
   return result.release();
 }