Do not check pointers before deleting them.

xfa/fwl/basewidget/fxmath_barcodeimp.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
 
 #include "xfa/fwl/basewidget/fxmath_barcodeimp.h"
 
 #include "xfa/fxbarcode/cbc_codabar.h"
 #include "xfa/fxbarcode/cbc_code128.h"
@@ skipping 28 matching lines @@
       return new CBC_QRCode();
     case BC_PDF417:
       return new CBC_PDF417I();
     case BC_DATAMATRIX:
       return new CBC_DataMatrix();
     case BC_UNKNOWN:
     default:
       return NULL;
   }
 }
+
 CFX_Barcode::CFX_Barcode() {}
+
 CFX_Barcode::~CFX_Barcode() {
-  if (m_pBCEngine) {
-    delete m_pBCEngine;
-    m_pBCEngine = NULL;
-  }
+  delete m_pBCEngine;
 }
+
 FX_BOOL CFX_Barcode::Create(BC_TYPE type) {
   m_pBCEngine = FX_Barcode_CreateBarCodeEngineObject(type);
   return m_pBCEngine != NULL;
 }
 void CFX_Barcode::Release() {
   delete this;
 }
 BC_TYPE CFX_Barcode::GetType() {
   return m_pBCEngine ? m_pBCEngine->GetType() : BC_UNKNOWN;
 }
@@ skipping 313 matching lines @@
       continue;
     }
     CFX_WideString ret = pTmpEngine->Decode(pBitmap, errorCode);
     if (errorCode == BCExceptionNO) {
       return ret;
     }
   }
   errorCode = BCExceptionUnSupportedBarcode;
   return CFX_WideString();
 }