Cleanup: Do not check pointers before deleting them.

core/src/fpdfapi/fpdf_parser/fpdf_parser_filters.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 "../../../../third_party/zlib_v128/zlib.h"
 #include "../../../include/fpdfapi/fpdf_parser.h"
 #include "../../../include/fxcodec/fx_codec.h"
 #include "../../../include/fpdfapi/fpdf_module.h"
 #include "filters_int.h"
 
 CFX_DataFilter::CFX_DataFilter()
 {
     m_bEOF = FALSE;
     m_pDestFilter = NULL;
     m_SrcPos = 0;
 }
 CFX_DataFilter::~CFX_DataFilter()
 {
-    if (m_pDestFilter) {
-        delete m_pDestFilter;
-    }
+    delete m_pDestFilter;
 }
 void CFX_DataFilter::SetDestFilter(CFX_DataFilter* pFilter)
 {
     if (m_pDestFilter) {
         m_pDestFilter->SetDestFilter(pFilter);
     } else {
         m_pDestFilter = pFilter;
     }
 }
 void CFX_DataFilter::FilterIn(const uint8_t* src_buf, FX_DWORD src_size, CFX_BinaryBuf& dest_buf)
@@ skipping 151 matching lines @@
     }
     CPDF_StreamFilter* pStreamFilter = new CPDF_StreamFilter;
     pStreamFilter->m_pStream = this;
     pStreamFilter->m_pFilter = pFirstFilter;
     pStreamFilter->m_pBuffer = NULL;
     pStreamFilter->m_SrcOffset = 0;
     return pStreamFilter;
 }
 CPDF_StreamFilter::~CPDF_StreamFilter()
 {
-    if (m_pFilter) {
-        delete m_pFilter;
-    }
-    if (m_pBuffer) {
-        delete m_pBuffer;
-    }
+    delete m_pFilter;
+    delete m_pBuffer;
 }
 #define FPDF_FILTER_BUFFER_IN_SIZE      FPDF_FILTER_BUFFER_SIZE
 FX_DWORD CPDF_StreamFilter::ReadBlock(uint8_t* buffer, FX_DWORD buf_size)
 {
     if (m_pFilter == NULL) {
         FX_DWORD read_size = m_pStream->GetRawSize() - m_SrcOffset;
         if (read_size == 0) {
             return 0;
         }
         if (read_size > buf_size) {
@@ skipping 689 matching lines @@
     }
     if (m_bEndOfLine)
         if (!_FaxSkipEOL(src_buf, bitsize, bitpos)) {
             return FALSE;
         }
     if (m_bByteAlign) {
         bitpos = (bitpos + 7) / 8 * 8;
     }
     return TRUE;
 }