dmime: Make stub returns a error to avoid crashing.

dlls/dmime/performance.c

@@ -787,7 +787,7 @@ static HRESULT WINAPI IDirectMusicPerformance8Impl_PlaySegmentEx (LPDIRECTMUSICP
 	IDirectMusicPerformance8Impl *This = (IDirectMusicPerformance8Impl *)iface;
 	FIXME("(%p, %p, %p, %p, %d, 0x%s, %p, %p, %p): stub\n", This, pSource, pwzSegmentName,
 	    pTransition, dwFlags, wine_dbgstr_longlong(i64StartTime), ppSegmentState, pFrom, pAudioPath);
-	return S_OK;
+	return DMUS_E_SEGMENT_INIT_FAILED;
 }
 
 static HRESULT WINAPI IDirectMusicPerformance8Impl_StopEx (LPDIRECTMUSICPERFORMANCE8 iface, IUnknown* pObjectToStop, __int64 i64StopTime, DWORD dwFlags) {