ALSA: fireworks/bebob/dice/oxfw: make it possible to shutdown safely

ALSA: fireworks/bebob/dice/oxfw: make it possible to shutdown safely

commit dec84316dd53c90e93b4ee849483bd4bd1e9a585 upstream.

A part of these drivers, especially BeBoB driver, are programmed to wait
some events. Thus the drivers should not destroy any data in .remove()
context.

This commit moves some destructors from 'struct fw_driver.remove()' to
'struct snd_card.private_free()' to shutdown safely.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>