Fix all the code which has duplicate variable declarations

xfa/fxfa/parser/xfa_document_serialize.cpp

Index: xfa/fxfa/parser/xfa_document_serialize.cpp
diff --git a/xfa/fxfa/parser/xfa_document_serialize.cpp b/xfa/fxfa/parser/xfa_document_serialize.cpp
index 497c8216dd89f04517e0386a5386a2ee83224b65..d7b8bf04d903033a519f72299c46bdd32e42121d 100644
--- a/xfa/fxfa/parser/xfa_document_serialize.cpp
+++ b/xfa/fxfa/parser/xfa_document_serialize.cpp
@@ -336,13 +336,12 @@ static void XFA_DataExporter_RegenerateFormFile_Changed(
           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;