msxml3: Correct createElement return value for an invalid type.

dlls/msxml3/tests/xmldoc.c

@@ -270,8 +270,8 @@ static void test_createElement(void)
     V_I4(&vType) = -1;
     V_VT(&vName) = VT_NULL;
     hr = IXMLDocument_createElement(doc, vType, vName, &element);
-    ok(hr == S_OK, "Expected S_OK, got %d\n", hr);
-    ok(element != NULL, "Expected non-NULL element\n");
+    ok(hr == E_NOTIMPL, "Expected S_OK, got %d\n", hr);
+    ok(element == NULL, "Expected NULL element\n");
 
     if (element != NULL)
     {

dlls/msxml3/xmldoc.c

@@ -453,6 +453,9 @@ static HRESULT WINAPI xmldoc_createElement(IXMLDocument *iface, VARIANT vType,
     if (V_VT(&vType) != VT_I4)
         return E_INVALIDARG;
 
+    if(type_msxml_to_libxml(V_I4(&vType)) == -1)
+        return E_NOTIMPL;
+
     node = xmlNewNode(NULL, empty);
     node->type = type_msxml_to_libxml(V_I4(&vType));