ALSA: firewire-tascam: Add missing annotation for tscm_hwdep_read_locked()

Sparse reports a warning at tscm_hwdep_read_locked()

warning: context imbalance in tscm_hwdep_read_locked() - unexpected unlock

The root cause is the missing annotation at tscm_hwdep_read_locked()
Add the missing __releases(&tscm->lock) annotation
Signed-off-by: Jules Irenge <jbi.octave@gmail.com>
Acked-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20200311010908.42366-9-jbi.octave@gmail.comSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/tascam/tascam-hwdep.c

@@ -17,6 +17,7 @@
 
 static long tscm_hwdep_read_locked(struct snd_tscm *tscm, char __user *buf,
 				   long count, loff_t *offset)
+	__releases(&tscm->lock)
 {
 	struct snd_firewire_event_lock_status event = {
 		.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS,