Re-enable several MSVC warnings

core/fpdfapi/fpdf_parser/cpdf_parser.cpp

 // Copyright 2016 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/fpdfapi/fpdf_parser/include/cpdf_parser.h"
 
 #include <vector>
 
@@ skipping 1520 matching lines @@
 
   if (!IsLinearizedFile(pFileAccess, offset)) {
     m_pSyntax->m_pFileAccess = nullptr;
     return StartParse(pFileAccess);
   }
 
   m_pDocument = new CPDF_Document(this);
   FX_FILESIZE dwFirstXRefOffset = m_pSyntax->SavePos();
 
   FX_BOOL bXRefRebuilt = FALSE;
-  FX_BOOL bLoadV4 = FALSE;
-  if (!(bLoadV4 = LoadCrossRefV4(dwFirstXRefOffset, 0, FALSE)) &&
-      !LoadCrossRefV5(&dwFirstXRefOffset, TRUE)) {
+  FX_BOOL bLoadV4 = LoadCrossRefV4(dwFirstXRefOffset, 0, FALSE);
+  if (!bLoadV4 && !LoadCrossRefV5(&dwFirstXRefOffset, TRUE)) {
     if (!RebuildCrossRef())
       return FORMAT_ERROR;
 
     bXRefRebuilt = TRUE;
     m_LastXRefOffset = 0;
   }
 
   if (bLoadV4) {
     m_pTrailer = LoadTrailerV4();
     if (!m_pTrailer)
@@ skipping 90 matching lines @@
   if (!LoadLinearizedAllCrossRefV4(m_LastXRefOffset, m_dwXrefStartObjNum) &&
       !LoadLinearizedAllCrossRefV5(m_LastXRefOffset)) {
     m_LastXRefOffset = 0;
     m_pSyntax->m_MetadataObjnum = dwSaveMetadataObjnum;
     return FORMAT_ERROR;
   }
 
   m_pSyntax->m_MetadataObjnum = dwSaveMetadataObjnum;
   return SUCCESS;
 }