ALSA: seq: oss/rw: Cleanup with guard

Replace the manual spin lock/unlock pairs with guard() for code
simplification.

Only code refactoring, and no behavior change.

Signed-off-by: Takashi Iwai <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

sound/core/seq/oss/seq_oss_readq.c

···
 int
 snd_seq_oss_readq_put_event(struct seq_oss_readq *q, union evrec *ev)
 {
-	unsigned long flags;
-
-	spin_lock_irqsave(&q->lock, flags);
-	if (q->qlen >= q->maxlen - 1) {
-		spin_unlock_irqrestore(&q->lock, flags);
+	guard(spinlock_irqsave)(&q->lock);
+	if (q->qlen >= q->maxlen - 1)
 		return -ENOMEM;
-	}
 
 	memcpy(&q->q[q->tail], ev, sizeof(*ev));
 	q->tail = (q->tail + 1) % q->maxlen;
···
 
 	/* wake up sleeper */
 	wake_up(&q->midi_sleep);
-
-	spin_unlock_irqrestore(&q->lock, flags);
 
 	return 0;
 }

sound/core/seq/oss/seq_oss_writeq.c

···
 void
 snd_seq_oss_writeq_wakeup(struct seq_oss_writeq *q, abstime_t time)
 {
-	unsigned long flags;
-
-	spin_lock_irqsave(&q->sync_lock, flags);
+	guard(spinlock_irqsave)(&q->sync_lock);
 	q->sync_time = time;
 	q->sync_event_put = 0;
 	wake_up(&q->sync_sleep);
-	spin_unlock_irqrestore(&q->sync_lock, flags);
 }