fix a few linux compilation warnings

core/src/fxge/dib/fx_dib_convert.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 "../../../include/fxcodec/fx_codec.h"
 const FX_DWORD g_dwWinPalette[256] = {
@@ skipping 567 matching lines @@
                     break;
                 }
         }
     }
     FXSYS_memcpy32(dst_plt, pPalette, sizeof(FX_DWORD) * 256);
     return TRUE;
 }
 FX_BOOL _ConvertBuffer_Rgb2PltRgb8(FX_LPBYTE dest_buf, int dest_pitch, int width, int height,
                                    const CFX_DIBSource* pSrcBitmap, int src_left, int src_top, FX_DWORD* dst_plt, void* pIccTransform)
 {
-    ICodec_IccModule* pIccModule = NULL;
-    if (pIccTransform) {
-        pIccModule = CFX_GEModule::Get()->GetCodecModule()->GetIccModule();
-    }
     FX_BOOL ret = _ConvertBuffer_Rgb2PltRgb8_NoTransform(dest_buf, dest_pitch, width, height, pSrcBitmap, src_left, src_top, dst_plt);
     if (ret && pIccTransform) {
         ICodec_IccModule* pIccModule = CFX_GEModule::Get()->GetCodecModule()->GetIccModule();
         for (int i = 0; i < 256; i++) {
             FX_ARGB* plt = dst_plt + i;
             FX_ARGB plt_entry = FXARGB_TODIB(*plt);
             pIccModule->TranslateScanline(pIccTransform, (FX_LPBYTE)&plt_entry, (FX_LPCBYTE)&plt_entry, 1);
             *plt = FXARGB_TODIB(plt_entry);
         }
     }
@@ skipping 476 matching lines @@
     if (!m_bExtBuf) {
         FX_Free(m_pBuffer);
     }
     m_bExtBuf = FALSE;
     m_pBuffer = dest_buf;
     m_bpp = (FX_BYTE)dest_format;
     m_AlphaFlag = (FX_BYTE)(dest_format >> 8);
     m_Pitch = dest_pitch;
     return TRUE;
 }