Get rid of NULLs in xfa/fxbarcode/

xfa/fxbarcode/BC_TwoDimWriter.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
 
 #include <algorithm>
 
 #include "core/fxge/include/fx_ge.h"
 #include "third_party/base/numerics/safe_math.h"
 #include "xfa/fxbarcode/BC_TwoDimWriter.h"
 #include "xfa/fxbarcode/BC_Writer.h"
 #include "xfa/fxbarcode/common/BC_CommonBitMatrix.h"
 
 CBC_TwoDimWriter::CBC_TwoDimWriter() {
   m_iCorrectLevel = 1;
   m_bFixedSize = TRUE;
-  m_output = NULL;
+  m_output = nullptr;
 }
 CBC_TwoDimWriter::~CBC_TwoDimWriter() {
   delete m_output;
 }
 void CBC_TwoDimWriter::RenderDeviceResult(CFX_RenderDevice* device,
                                           const CFX_Matrix* matrix) {
   CFX_GraphStateData stateData;
   CFX_PathData path;
   path.AppendRect(0, 0, (FX_FLOAT)m_Width, (FX_FLOAT)m_Height);
   device->DrawPath(&path, matrix, &stateData, m_backgroundColor,
@@ skipping 110 matching lines @@
     for (int32_t inputX = 0, outputX = leftPadding;
          (inputX < inputWidth) && (outputX < outputWidth - multiX);
          inputX++, outputX += multiX) {
       if (code[inputX + inputY * inputWidth] == 1) {
         m_output->SetRegion(outputX, outputY, multiX, multiY, e);
         BC_EXCEPTION_CHECK_ReturnVoid(e);
       }
     }
   }
 }