Change some ints to bools in JBIG2 code.

core/fxcodec/jbig2/JBig2_GrrdProc.cpp

 // Copyright 2015 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 "core/fxcodec/jbig2/JBig2_GrrdProc.h"
 
 #include <memory>
 
 #include "core/fxcodec/jbig2/JBig2_ArithDecoder.h"
 #include "core/fxcodec/jbig2/JBig2_BitStream.h"
 #include "core/fxcodec/jbig2/JBig2_Image.h"
 
 CJBig2_Image* CJBig2_GRRDProc::decode(CJBig2_ArithDecoder* pArithDecoder,
                                       JBig2ArithCtx* grContext) {
   if (GRW == 0 || GRH == 0)
     return new CJBig2_Image(GRW, GRH);
 
-  if (GRTEMPLATE == 0) {
+  if (!GRTEMPLATE) {
     if ((GRAT[0] == -1) && (GRAT[1] == -1) && (GRAT[2] == -1) &&
         (GRAT[3] == -1) && (GRREFERENCEDX == 0) &&
         (GRW == (uint32_t)GRREFERENCE->width())) {
       return decode_Template0_opt(pArithDecoder, grContext);
     }
     return decode_Template0_unopt(pArithDecoder, grContext);
   }
 
   if ((GRREFERENCEDX == 0) && (GRW == (uint32_t)GRREFERENCE->width()))
     return decode_Template1_opt(pArithDecoder, grContext);
@@ skipping 463 matching lines @@
         pLine[w >> 3] = cVal;
       }
     }
     pLine += nStride;
     if (h < GRHR + GRREFERENCEDY) {
       pLineR += nStrideR;
     }
   }
   return GRREG.release();
 }