Fix a bunch of -Wunused-but-set-variable warnings.

core/src/fpdfapi/fpdf_render/fpdf_render_pattern.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/fpdfapi/fpdf_render.h"
 #include "../../../include/fpdfapi/fpdf_pageobj.h"
 #include "../../../include/fxge/fx_ge.h"
 #include "../fpdf_page/pageint.h"
@@ skipping 1077 matching lines @@
         return;
     }
     if(pattern->m_PatternType == PATTERN_TILING) {
         DrawTilingPattern((CPDF_TilingPattern*)pattern, pPathObj, pObj2Device, bStroke);
     } else {
         DrawShadingPattern((CPDF_ShadingPattern*)pattern, pPathObj, pObj2Device, bStroke);
     }
 }
 void CPDF_RenderStatus::ProcessPathPattern(CPDF_PathObject* pPathObj, const CFX_AffineMatrix* pObj2Device, int& filltype, FX_BOOL& bStroke)
 {
-    FX_BOOL bPattern = FALSE;
     if(filltype) {
         CPDF_Color& FillColor = *pPathObj->m_ColorState.GetFillColor();
         if(FillColor.m_pCS && FillColor.m_pCS->GetFamily() == PDFCS_PATTERN) {
             DrawPathWithPattern(pPathObj, pObj2Device, &FillColor, FALSE);
             filltype = 0;
-            bPattern = TRUE;
         }
     }
     if(bStroke) {
         CPDF_Color& StrokeColor = *pPathObj->m_ColorState.GetStrokeColor();
         if(StrokeColor.m_pCS && StrokeColor.m_pCS->GetFamily() == PDFCS_PATTERN) {
             DrawPathWithPattern(pPathObj, pObj2Device, &StrokeColor, TRUE);
             bStroke = FALSE;
-            bPattern = TRUE;
         }
     }
 }