Re: [PATCH v2 0/1] MR11149: windowscodecs: Decode GIF frames on demand.

[Esme Povirk (＠madewokherd)]

Esme Povirk (@madewokherd) commented about dlls/windowscodecs/gifformat.c:
> seek.QuadPart = 0;
>      IStream_Seek(stream, seek, STREAM_SEEK_SET, NULL);
>
> +    /* keep stream for on-demand frame decoding */
> +    IStream_AddRef(stream);
> +    decoder->stream = stream;
> +
>      /* read all data from the stream */
>      decoder->gif = DGifOpen((void *)stream, _gif_inputfunc);
>      if (!decoder->gif)
> +    {
> +        IStream_Release(stream);

We should set `decoder->stream` to NULL when releasing it, so we don't release it twice when the object is freed.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/11149#note_143158