ALSA fireworks driver allocates memory object to handle response from
target unit. The object is used to initiate transaction unique to
Fireworks board module. This can be released as managed-resource
of 'struct snd_card.card_dev'.

This commit uses managed-resource of the sound card device for this
purpose.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>