msxml3: Use IXMLDOMNode_get_nodeType in xmlnode_appendChild.

dlls/msxml3/node.c

@@ -661,27 +661,16 @@ static HRESULT WINAPI xmlnode_appendChild(
     IXMLDOMNode** outNewChild)
 {
     xmlnode *This = impl_from_IXMLDOMNode( iface );
-    IXMLDOMNode *pAttr = NULL;
+    DOMNodeType type;
     VARIANT var;
+    HRESULT hr;
 
     TRACE("(%p)->(%p,%p)\n", This, newChild, outNewChild);
 
-    /* Cannot Append an Attribute node. */
-    IUnknown_QueryInterface(newChild, &IID_IXMLDOMNode, (LPVOID*)&pAttr);
-    if(pAttr)
-    {
-        xmlnode *ThisNew = impl_from_IXMLDOMNode( pAttr );
-
-        if(ThisNew->node->type == XML_ATTRIBUTE_NODE)
-        {
-            if(outNewChild) *outNewChild = NULL;
-
-            IUnknown_Release(pAttr);
-
-            return E_FAIL;
-        }
-
-        IUnknown_Release(pAttr);
+    hr = IXMLDOMNode_get_nodeType(newChild, &type);
+    if(FAILED(hr) || type == NODE_ATTRIBUTE) {
+        if(outNewChild) *outNewChild = NULL;
+        return E_FAIL;
     }
 
     VariantInit(&var);