Get rid of NULLs in xfa/fxbarcode/

xfa/fxbarcode/oned/BC_OnedCodaBarWriter.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 2011 ZXing authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ skipping 119 matching lines @@
     }
   }
   return filtercontents;
 }
 uint8_t* CBC_OnedCodaBarWriter::Encode(const CFX_ByteString& contents,
                                        BCFORMAT format,
                                        int32_t& outWidth,
                                        int32_t& outHeight,
                                        int32_t& e) {
   uint8_t* ret = Encode(contents, format, outWidth, outHeight, 0, e);
-  BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+  BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
   return ret;
 }
 uint8_t* CBC_OnedCodaBarWriter::Encode(const CFX_ByteString& contents,
                                        BCFORMAT format,
                                        int32_t& outWidth,
                                        int32_t& outHeight,
                                        int32_t hints,
                                        int32_t& e) {
   if (format != BCFORMAT_CODABAR) {
     e = BCExceptionOnlyEncodeCODEBAR;
-    return NULL;
+    return nullptr;
   }
   uint8_t* ret =
       CBC_OneDimWriter::Encode(contents, format, outWidth, outHeight, hints, e);
-  BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+  BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
   return ret;
 }
 uint8_t* CBC_OnedCodaBarWriter::Encode(const CFX_ByteString& contents,
                                        int32_t& outLength,
                                        int32_t& e) {
   CBC_OnedCodaBarReader CodaBarR;
   CFX_ByteString data = m_chStart + contents + m_chEnd;
   m_iContentLen = data.GetLength();
   uint8_t* result = FX_Alloc2D(uint8_t, m_iWideNarrRatio * 7, data.GetLength());
   FX_CHAR ch;
@@ skipping 56 matching lines @@
   return strStart + contents + strEnd;
 }
 void CBC_OnedCodaBarWriter::RenderResult(const CFX_WideStringC& contents,
                                          uint8_t* code,
                                          int32_t codeLength,
                                          FX_BOOL isDevice,
                                          int32_t& e) {
   CBC_OneDimWriter::RenderResult(encodedContents(contents).AsStringC(), code,
                                  codeLength, isDevice, e);
 }