Get rid of NULLs in xfa/fxbarcode/

xfa/fxbarcode/datamatrix/BC_EncoderContext.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 2006-2007 Jeremias Maerki.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ skipping 28 matching lines @@
     FX_WCHAR ch = (FX_WCHAR)(dststr.GetAt(i) & 0xff);
     if (ch == '?' && dststr.GetAt(i) != '?') {
       e = BCExceptionCharactersOutsideISO88591Encoding;
     }
     sb += ch;
   }
   m_msg = sb;
   m_shape = FORCE_NONE;
   m_newEncoding = -1;
   m_pos = 0;
-  m_symbolInfo = NULL;
+  m_symbolInfo = nullptr;
   m_skipAtEnd = 0;
-  m_maxSize = NULL;
-  m_minSize = NULL;
+  m_maxSize = nullptr;
+  m_minSize = nullptr;
 }
 CBC_EncoderContext::~CBC_EncoderContext() {}
 void CBC_EncoderContext::setSymbolShape(SymbolShapeHint shape) {
   m_shape = shape;
 }
 void CBC_EncoderContext::setSizeConstraints(CBC_Dimension* minSize,
                                             CBC_Dimension* maxSize) {
   m_maxSize = maxSize;
   m_minSize = minSize;
 }
@@ skipping 27 matching lines @@
 FX_BOOL CBC_EncoderContext::hasMoreCharacters() {
   return m_pos < getTotalMessageCharCount();
 }
 int32_t CBC_EncoderContext::getRemainingCharacters() {
   return getTotalMessageCharCount() - m_pos;
 }
 void CBC_EncoderContext::updateSymbolInfo(int32_t& e) {
   updateSymbolInfo(getCodewordCount(), e);
 }
 void CBC_EncoderContext::updateSymbolInfo(int32_t len, int32_t& e) {
-  if (m_symbolInfo == NULL || len > m_symbolInfo->m_dataCapacity) {
+  if (!m_symbolInfo || len > m_symbolInfo->m_dataCapacity) {
     m_symbolInfo =
         CBC_SymbolInfo::lookup(len, m_shape, m_minSize, m_maxSize, true, e);
     BC_EXCEPTION_CHECK_ReturnVoid(e);
   }
 }
 void CBC_EncoderContext::resetSymbolInfo() {
   m_shape = FORCE_NONE;
 }
 int32_t CBC_EncoderContext::getTotalMessageCharCount() {
   return m_msg.GetLength() - m_skipAtEnd;
 }