ole32: IPersistStream is also implemented by any object that implements IStream.

dlls/ole32/stg_stream.c

@@ -122,6 +122,7 @@ static HRESULT WINAPI StgStreamImpl_QueryInterface(
    * Compare the riid with the interface IDs implemented by this object.
    */
   if (IsEqualGUID(&IID_IUnknown, riid)||
+      IsEqualGUID(&IID_IPersistStream, riid)||
       IsEqualGUID(&IID_IStream, riid))
   {
     *ppvObject = (IStream*)This;