Cleanup: Do not check pointers before deleting them.

core/src/fxge/dib/fx_dib_engine.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/fxge/fx_dib.h"
 #include "../../../include/fxge/fx_ge.h"
 #include "dib_int.h"
 #include <limits.h>
@@ skipping 661 matching lines @@
 {
     m_pScanline = NULL;
     m_pStretchEngine = NULL;
     m_pMaskScanline = NULL;
 }
 CFX_ImageStretcher::~CFX_ImageStretcher()
 {
     if (m_pScanline) {
         FX_Free(m_pScanline);
     }
-    if (m_pStretchEngine) {
-        delete m_pStretchEngine;
-    }
+    delete m_pStretchEngine;
     if (m_pMaskScanline) {
         FX_Free(m_pMaskScanline);
     }
 }
 FXDIB_Format _GetStretchedFormat(const CFX_DIBSource* pSrc)
 {
     FXDIB_Format format = pSrc->GetFormat();
     if (format == FXDIB_1bppMask) {
         format = FXDIB_8bppMask;
     } else if (format == FXDIB_1bppRgb) {
@@ skipping 136 matching lines @@
             return TRUE;
         }
         m_pSource->DownSampleScanline(src_y, m_pScanline, m_DestBPP, m_DestWidth, m_bFlipX, m_ClipRect.left, result_width);
         if (m_pMaskScanline) {
             m_pSource->m_pAlphaMask->DownSampleScanline(src_y, m_pMaskScanline, 1, m_DestWidth, m_bFlipX, m_ClipRect.left, result_width);
         }
         m_pDest->ComposeScanline(dest_y, m_pScanline, m_pMaskScanline);
     }
     return FALSE;
 }