Get rid of NULLs in xfa/fxbarcode/

xfa/fxbarcode/qrcode/BC_QRCoderErrorCorrectionLevel.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 2007 ZXing authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 
 #include "xfa/fxbarcode/qrcode/BC_QRCoderErrorCorrectionLevel.h"
 
-CBC_QRCoderErrorCorrectionLevel* CBC_QRCoderErrorCorrectionLevel::L = NULL;
-CBC_QRCoderErrorCorrectionLevel* CBC_QRCoderErrorCorrectionLevel::M = NULL;
-CBC_QRCoderErrorCorrectionLevel* CBC_QRCoderErrorCorrectionLevel::Q = NULL;
-CBC_QRCoderErrorCorrectionLevel* CBC_QRCoderErrorCorrectionLevel::H = NULL;
+CBC_QRCoderErrorCorrectionLevel* CBC_QRCoderErrorCorrectionLevel::L = nullptr;
+CBC_QRCoderErrorCorrectionLevel* CBC_QRCoderErrorCorrectionLevel::M = nullptr;
+CBC_QRCoderErrorCorrectionLevel* CBC_QRCoderErrorCorrectionLevel::Q = nullptr;
+CBC_QRCoderErrorCorrectionLevel* CBC_QRCoderErrorCorrectionLevel::H = nullptr;
 
 CBC_QRCoderErrorCorrectionLevel::CBC_QRCoderErrorCorrectionLevel(
     int32_t ordinal,
     int32_t bits,
     FX_CHAR* name) {
   m_name += name;
   m_ordinal = ordinal;
   m_bits = bits;
 }
 CBC_QRCoderErrorCorrectionLevel::~CBC_QRCoderErrorCorrectionLevel() {}
@@ skipping 23 matching lines @@
   switch (bits) {
     case 0x00:
       return M;
     case 0x01:
       return L;
     case 0x02:
       return H;
     case 0x03:
       return Q;
     default:
-      return NULL;
+      return nullptr;
   }
 }
 void CBC_QRCoderErrorCorrectionLevel::Destroy() {
   if (L) {
     delete CBC_QRCoderErrorCorrectionLevel::L;
-    L = NULL;
+    L = nullptr;
   }
   if (M) {
     delete CBC_QRCoderErrorCorrectionLevel::M;
-    M = NULL;
+    M = nullptr;
   }
   if (H) {
     delete CBC_QRCoderErrorCorrectionLevel::H;
-    H = NULL;
+    H = nullptr;
   }
   if (Q) {
     delete CBC_QRCoderErrorCorrectionLevel::Q;
-    Q = NULL;
+    Q = nullptr;
   }
 }