Remove "this==NULL" and adjust corresponding callers

core/src/fxcrt/fx_xml_parser.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 "../../include/fxcrt/fx_xml.h"
 #include "xml_int.h"
 CXML_Parser::~CXML_Parser()
 {
-    if (m_bOwnedStream) {
+    if (m_bOwnedStream && m_pDataAcc) {
         m_pDataAcc->Release();
     }
 }
 FX_BOOL CXML_Parser::Init(FX_LPBYTE pBuffer, size_t size)
 {
     if (m_pAllocator) {
         m_pDataAcc = FX_NewAtAllocator(m_pAllocator)CXML_DataBufAcc(pBuffer, size, m_pAllocator);
     } else {
         m_pDataAcc = FX_NEW CXML_DataBufAcc(pBuffer, size, NULL);
     }
@@ skipping 986 matching lines @@
         item.Empty(pAllocator);
     }
     m_pMap->RemoveAll();
     if (pAllocator) {
         FX_DeleteAtAllocator(m_pMap, pAllocator, CFX_ObjectArray<CXML_AttrItem>);
     } else {
         delete m_pMap;
     }
     m_pMap = NULL;
 }