Get rid of NULLs in xfa/fxbarcode/

xfa/fxbarcode/oned/BC_OnedCode128Writer.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 2010 ZXing authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ skipping 89 matching lines @@
   return TRUE;
 }
 uint8_t* CBC_OnedCode128Writer::Encode(const CFX_ByteString& contents,
                                        BCFORMAT format,
                                        int32_t& outWidth,
                                        int32_t& outHeight,
                                        int32_t hints,
                                        int32_t& e) {
   if (format != BCFORMAT_CODE_128) {
     e = BCExceptionOnlyEncodeCODE_128;
-    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_OnedCode128Writer::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;
 }
 FX_BOOL CBC_OnedCode128Writer::IsDigits(const CFX_ByteString& contents,
                                         int32_t start,
                                         int32_t length) {
   int32_t end = start + length;
   for (int32_t i = start; i < end; i++) {
     if (contents[i] < '0' || contents[i] > '9') {
       return FALSE;
     }
@@ skipping 88 matching lines @@
       }
     }
     patterns->Add(CBC_OnedCode128Reader::CODE_PATTERNS[patternIndex]);
     checkSum += patternIndex * checkWeight;
     if (position != 0) {
       checkWeight++;
     }
   }
   return checkSum;
 }