block: Simplify append_open_options()
This function returns a BDS's driver-specific options, excluding also those from its children. Since we have just removed all children options from bs->options there's no need to do this last step. We allow references to children, though ("backing": "node0"), so those we still have to remove. Signed-off-by: NAlberto Garcia <berto@igalia.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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