Do not check pointers before deleting them.

xfa/fxbarcode/common/reedsolomon/BC_ReedSolomonGF256.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");
@@ skipping 13 matching lines @@
 #include "xfa/fxbarcode/common/reedsolomon/BC_ReedSolomonGF256Poly.h"
 
 CBC_ReedSolomonGF256* CBC_ReedSolomonGF256::QRCodeFild = NULL;
 CBC_ReedSolomonGF256* CBC_ReedSolomonGF256::DataMatrixField = NULL;
 void CBC_ReedSolomonGF256::Initialize() {
   QRCodeFild = new CBC_ReedSolomonGF256(0x011D);
   QRCodeFild->Init();
   DataMatrixField = new CBC_ReedSolomonGF256(0x012D);
   DataMatrixField->Init();
 }
+
 void CBC_ReedSolomonGF256::Finalize() {
-  if (QRCodeFild) {
-    delete QRCodeFild;
-  }
-  QRCodeFild = NULL;
-  if (DataMatrixField) {
-    delete DataMatrixField;
-  }
-  DataMatrixField = NULL;
+  delete QRCodeFild;
+  QRCodeFild = nullptr;
+  delete DataMatrixField;
+  DataMatrixField = nullptr;
 }
+
 CBC_ReedSolomonGF256::CBC_ReedSolomonGF256(int32_t primitive) {
   int32_t x = 1;
   for (int32_t j = 0; j < 256; j++) {
     m_expTable[j] = x;
     x <<= 1;
     if (x >= 0x100) {
       x ^= primitive;
     }
   }
   for (int32_t i = 0; i < 255; i++) {
@@ skipping 61 matching lines @@
     return 0;
   }
   if (a == 1) {
     return b;
   }
   if (b == 1) {
     return a;
   }
   return m_expTable[(m_logTable[a] + m_logTable[b]) % 255];
 }