[PATCH 0/1] MR5698: shcore: Check optional pointer in filestream_CopyTo() before writing to it.

[Danyil Blyschak (＠blyss)]

Check that the 'written' parameter in this function is non-null before
incrementing it by 'written_chunk'.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/5698