Re-enable several MSVC warnings

fpdfsdk/fpdfppo.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 "public/fpdf_ppo.h"
 
 #include <map>
 #include <memory>
@@ skipping 68 matching lines @@
   }
 
   CFX_ByteString cbPageType = pNewPages->GetStringBy("Type", "");
   if (cbPageType.Equal("")) {
     pNewPages->SetAt("Type", new CPDF_Name("Pages"));
   }
 
   CPDF_Array* pKeysArray = pNewPages->GetArrayBy("Kids");
   if (!pKeysArray) {
     CPDF_Array* pNewKids = new CPDF_Array;
-    FX_DWORD Kidsobjnum = -1;
-    Kidsobjnum = pDestPDFDoc->AddIndirectObject(pNewKids);
+    FX_DWORD Kidsobjnum = pDestPDFDoc->AddIndirectObject(pNewKids);
 
     pNewPages->SetAt("Kids", new CPDF_Reference(pDestPDFDoc, Kidsobjnum));
     pNewPages->SetAt("Count", new CPDF_Number(0));
   }
 
   return TRUE;
 }
 
 FX_BOOL CPDF_PageOrganizer::ExportPage(CPDF_Document* pSrcPDFDoc,
                                        std::vector<FX_WORD>* pPageNums,
@@ skipping 306 matching lines @@
   if (!pSrcDict)
     return FALSE;
 
   CPDF_Dictionary* pDstDict = pDstDoc->GetRoot();
   if (!pDstDict)
     return FALSE;
 
   pDstDict->SetAt("ViewerPreferences", pSrcDict->Clone(TRUE));
   return TRUE;
 }