Fix uninitialized offset

core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.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_parser.h"
 #include "../../../include/fpdfapi/fpdf_module.h"
 #include "../../../include/fpdfapi/fpdf_page.h"
 #include "../fpdf_page/pageint.h"
@@ skipping 3060 matching lines @@
         if (!m_pFileAvail->IsDataAvail(offset, size)) {
             pHints->AddSegment(offset, size);
             return NULL;
         }
         pRet = m_parser.ParseIndirectObject(NULL, objnum);
         if (!pRet && pExistInFile) {
             *pExistInFile = FALSE;
         }
         return pRet;
     }
-    FX_FILESIZE offset;
+    FX_FILESIZE offset = 0;
     FX_DWORD size = GetObjectSize(objnum, offset);
     size = (FX_DWORD)((FX_FILESIZE)(offset + size + 512) > m_dwFileLen ? m_dwFileLen - offset : size + 512);
     if (!m_pFileAvail->IsDataAvail(offset, size)) {
         pHints->AddSegment(offset, size);
         return NULL;
     }
     CPDF_Parser *pParser = (CPDF_Parser *)(m_pDocument->GetParser());
     pRet = pParser->ParseIndirectObject(NULL, objnum, NULL);
     if (!pRet && pExistInFile) {
         *pExistInFile = FALSE;
@@ skipping 1288 matching lines @@
 {
     FX_INT32 iSize = m_childNode.GetSize();
     for (FX_INT32 i = 0; i < iSize; ++i) {
         CPDF_PageNode *pNode = (CPDF_PageNode*)m_childNode[i];
         if (pNode) {
             delete pNode;
         }
     }
     m_childNode.RemoveAll();
 }