Get rid of NULLs in xfa/fxbarcode/

xfa/fxbarcode/pdf417/BC_PDF417Writer.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 2012 ZXing authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ skipping 41 matching lines @@
   int32_t col = (m_Width / m_ModuleWidth - 69) / 17;
   int32_t row = m_Height / (m_ModuleWidth * 20);
   if (row >= 3 && row <= 90 && col >= 1 && col <= 30) {
     encoder.setDimensions(col, col, row, row);
   } else if (col >= 1 && col <= 30) {
     encoder.setDimensions(col, col, 90, 3);
   } else if (row >= 3 && row <= 90) {
     encoder.setDimensions(30, 1, row, row);
   }
   encoder.generateBarcodeLogic(contents, m_iCorrectLevel, e);
-  BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+  BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
   int32_t lineThickness = 2;
   int32_t aspectRatio = 4;
   CBC_BarcodeMatrix* barcodeMatrix = encoder.getBarcodeMatrix();
   CFX_ByteArray originalScale;
   originalScale.Copy(barcodeMatrix->getScaledMatrix(
       lineThickness, aspectRatio * lineThickness));
   int32_t width = outWidth;
   int32_t height = outHeight;
   outWidth = barcodeMatrix->getWidth();
   outHeight = barcodeMatrix->getHeight();
@@ skipping 33 matching lines @@
                                    int32_t width) {
   CFX_ByteArray temp;
   temp.Copy(bitarray);
   for (int32_t ii = 0; ii < height; ii++) {
     int32_t inverseii = height - ii - 1;
     for (int32_t jj = 0; jj < width; jj++) {
       bitarray[jj * height + inverseii] = temp[ii * width + jj];
     }
   }
 }