Fix all the code which has duplicate variable declarations

xfa/fxfa/parser/xfa_document_serialize.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 "xfa/fxfa/parser/xfa_document_serialize.h"
 
 #include "xfa/fde/xml/fde_xml_imp.h"
 #include "xfa/fgas/crt/fgas_codepage.h"
@@ skipping 318 matching lines @@
         XFA_DataExporter_RegenerateFormFile_Changed(pChildNode, newBuf,
                                                     bSaveXML);
         wsChildren += newBuf.AsStringC();
         newBuf.Clear();
         pChildNode = pChildNode->GetNodeItem(XFA_NODEITEM_NextSibling);
       }
       if (!bSaveXML && !wsChildren.IsEmpty() &&
           pNode->GetClassID() == XFA_ELEMENT_Items) {
         wsChildren.clear();
         bSaveXML = TRUE;
-        CXFA_Node* pChildNode = pNode->GetNodeItem(XFA_NODEITEM_FirstChild);
-        while (pChildNode) {
-          XFA_DataExporter_RegenerateFormFile_Changed(pChildNode, newBuf,
-                                                      bSaveXML);
+        CXFA_Node* pChild = pNode->GetNodeItem(XFA_NODEITEM_FirstChild);
+        while (pChild) {
+          XFA_DataExporter_RegenerateFormFile_Changed(pChild, newBuf, bSaveXML);
           wsChildren += newBuf.AsStringC();
           newBuf.Clear();
-          pChildNode = pChildNode->GetNodeItem(XFA_NODEITEM_NextSibling);
+          pChild = pChild->GetNodeItem(XFA_NODEITEM_NextSibling);
         }
       }
       break;
   }
   if (!wsChildren.IsEmpty() || !wsAttrs.IsEmpty() ||
       pNode->HasAttribute(XFA_ATTRIBUTE_Name)) {
     CFX_WideStringC wsElement;
     pNode->GetClassName(wsElement);
     CFX_WideString wsName;
     XFA_SaveAttribute(pNode, XFA_ATTRIBUTE_Name, FX_WSTRC(L"name"), TRUE,
@@ skipping 217 matching lines @@
         pXMLElement->RemoveAttribute(L"xfa:dataNode");
       }
     } else {
       CFDE_XMLNode* pXMLNode = pDataNode->GetXMLMappingNode();
       ASSERT(pXMLNode->GetType() == FDE_XMLNODE_Element);
       static_cast<CFDE_XMLElement*>(pXMLNode)->SetString(L"xfa:dataNode",
                                                          L"dataGroup");
     }
   }
 }