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Orignally proposed by Sam Revitch <[email protected]>. Unregister device files at disconnection to avoid the futher accesses. Also, the dev_unregister callback is removed and replaced with the combination of disconnect + free. A new function snd_card_free_when_closed() is introduced, which is used in USB disconnect callback. Signed-off-by: Takashi Iwai <[email protected]> Signed-off-by: Jaroslav Kysela <[email protected]>