ALSA: bebob: use managed-resource to maintain data specific to M-Audio FW-1814/ProjectMix I/O

ALSA bebob driver allocates memory object for data specific to M-Audio
FW-1884/ProjectMix I/O. The object is to maintain format of isochronous
packet payload for packet streaming by components for ALSA rawMIDI/PCM
interfaces. The object 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 <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>

sound/firewire/bebob/bebob.c

···
 {
 	snd_bebob_stream_destroy_duplex(bebob);
 
-	kfree(bebob->maudio_special_quirk);
-
 	mutex_destroy(&bebob->mutex);
 	fw_unit_put(bebob->unit);
 }
···
 error:
 	mutex_unlock(&devices_mutex);
 	snd_bebob_stream_destroy_duplex(bebob);
-	kfree(bebob->maudio_special_quirk);
-	bebob->maudio_special_quirk = NULL;
 	snd_card_free(bebob->card);
 	dev_info(&bebob->unit->device,
 		 "Sound card registration failed: %d\n", err);

sound/firewire/bebob/bebob_maudio.c

···
 	struct special_params *params;
 	int err;
 
-	params = kzalloc(sizeof(struct special_params), GFP_KERNEL);
-	if (params == NULL)
+	params = devm_kzalloc(&bebob->card->card_dev,
+			      sizeof(struct special_params), GFP_KERNEL);
+	if (!params)
 		return -ENOMEM;
 
 	mutex_lock(&bebob->mutex);