Don't bother checking pointers before delete[] and FX_Free().

core/src/fpdfapi/fpdf_parser/fpdf_parser_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 <utility>
 #include <vector>
 
 #include "../../../include/fpdfapi/fpdf_module.h"
@@ skipping 1714 matching lines @@
   m_pFileAccess = NULL;
   m_pCryptoHandler = NULL;
   m_pFileBuf = NULL;
   m_BufSize = CPDF_ModuleMgr::kFileBufSize;
   m_pFileBuf = NULL;
   m_MetadataObjnum = 0;
   m_dwWordPos = 0;
   m_bFileStream = FALSE;
 }
 CPDF_SyntaxParser::~CPDF_SyntaxParser() {
-  if (m_pFileBuf) {
-    FX_Free(m_pFileBuf);
-  }
+  FX_Free(m_pFileBuf);
 }
 FX_BOOL CPDF_SyntaxParser::GetCharAt(FX_FILESIZE pos, uint8_t& ch) {
   FX_FILESIZE save_pos = m_Pos;
   m_Pos = pos;
   FX_BOOL ret = GetNextChar(ch);
   m_Pos = save_pos;
   return ret;
 }
 FX_BOOL CPDF_SyntaxParser::GetNextChar(uint8_t& ch) {
   FX_FILESIZE pos = m_Pos + m_HeaderOffset;
@@ skipping 834 matching lines @@
   GetNextWord();
   numMarkers = ReadEOLMarkers(m_Pos);
   if (m_WordSize == ENDOBJ_LEN && numMarkers != 0 &&
       FXSYS_memcmp(m_WordBuffer, "endobj", ENDOBJ_LEN) == 0) {
     m_Pos = streamStartPos;
   }
   return pStream;
 }
 void CPDF_SyntaxParser::InitParser(IFX_FileRead* pFileAccess,
                                    FX_DWORD HeaderOffset) {
-  if (m_pFileBuf) {
-    FX_Free(m_pFileBuf);
-    m_pFileBuf = NULL;
-  }
+  FX_Free(m_pFileBuf);
   m_pFileBuf = FX_Alloc(uint8_t, m_BufSize);
   m_HeaderOffset = HeaderOffset;
   m_FileLen = pFileAccess->GetSize();
   m_Pos = 0;
   m_pFileAccess = pFileAccess;
   m_BufOffset = 0;
   pFileAccess->ReadBlock(
       m_pFileBuf, 0,
       (size_t)((FX_FILESIZE)m_BufSize > m_FileLen ? m_FileLen : m_BufSize));
 }
@@ skipping 2107 matching lines @@
   return FALSE;
 }
 CPDF_PageNode::~CPDF_PageNode() {
   int32_t iSize = m_childNode.GetSize();
   for (int32_t i = 0; i < iSize; ++i) {
     CPDF_PageNode* pNode = (CPDF_PageNode*)m_childNode[i];
     delete pNode;
   }
   m_childNode.RemoveAll();
 }