dmcompos: Mark IPersistStream_Save of DMSignPostTrack as a stub.

dlls/dmcompos/signposttrack.c

@@ -253,7 +253,14 @@ static HRESULT WINAPI IPersistStreamImpl_Load(IPersistStream *iface, IStream *pS
 static HRESULT WINAPI IPersistStreamImpl_Save(IPersistStream *iface, IStream *stream,
         BOOL cleardirty)
 {
-	return E_NOTIMPL;
+    IDirectMusicSignPostTrack *This = impl_from_IPersistStream(iface);
+
+    FIXME("(%p, %p, %d): stub\n", This, stream, cleardirty);
+
+    if (!stream)
+        return E_POINTER;
+
+    return E_NOTIMPL;
 }
 
 static const IPersistStreamVtbl persiststream_vtbl = {

dlls/dmcompos/tests/dmcompos.c

@@ -387,7 +387,7 @@ static void test_signposttrack(void)
     ok(IsEqualGUID(&class, &CLSID_DirectMusicSignPostTrack),
             "Expected class CLSID_DirectMusicSignPostTrack got %s\n", wine_dbgstr_guid(&class));
     hr = IPersistStream_Save(ps, NULL, TRUE);
-    todo_wine ok(hr == E_POINTER, "IPersistStream_Save failed: %08x\n", hr);
+    ok(hr == E_POINTER, "IPersistStream_Save failed: %08x\n", hr);
 
     /* Unimplemented IPersistStream methods */
     hr = IPersistStream_IsDirty(ps);