ALSA: cs5535audio: Use guard() for spin locks

Clean up the code using guard() for spin locks.

Merely code refactoring, and no behavior change.

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

sound/pci/cs5535audio/cs5535audio.c

···
 static void process_bm0_irq(struct cs5535audio *cs5535au)
 {
 	u8 bm_stat;
-	spin_lock(&cs5535au->reg_lock);
-	bm_stat = cs_readb(cs5535au, ACC_BM0_STATUS);
-	spin_unlock(&cs5535au->reg_lock);
+
+	scoped_guard(spinlock, &cs5535au->reg_lock) {
+		bm_stat = cs_readb(cs5535au, ACC_BM0_STATUS);
+	}
 	if (bm_stat & EOP) {
 		snd_pcm_period_elapsed(cs5535au->playback_substream);
 	} else {
···
 static void process_bm1_irq(struct cs5535audio *cs5535au)
 {
 	u8 bm_stat;
-	spin_lock(&cs5535au->reg_lock);
-	bm_stat = cs_readb(cs5535au, ACC_BM1_STATUS);
-	spin_unlock(&cs5535au->reg_lock);
+
+	scoped_guard(spinlock, &cs5535au->reg_lock) {
+		bm_stat = cs_readb(cs5535au, ACC_BM1_STATUS);
+	}
 	if (bm_stat & EOP)
 		snd_pcm_period_elapsed(cs5535au->capture_substream);
 }

sound/pci/cs5535audio/cs5535audio_pcm.c

···
 	dma->substream = substream;
 	dma->period_bytes = period_bytes;
 	dma->periods = periods;
-	spin_lock_irq(&cs5535au->reg_lock);
+	guard(spinlock_irq)(&cs5535au->reg_lock);
 	dma->ops->disable_dma(cs5535au);
 	dma->ops->setup_prd(cs5535au, jmpprd_addr);
-	spin_unlock_irq(&cs5535au->reg_lock);
 	return 0;
 }
 
···
 {
 	struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
 	struct cs5535audio_dma *dma = substream->runtime->private_data;
-	int err = 0;
 
-	spin_lock(&cs5535au->reg_lock);
+	guard(spinlock)(&cs5535au->reg_lock);
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		dma->ops->pause_dma(cs5535au);
···
 		break;
 	default:
 		dev_err(cs5535au->card->dev, "unhandled trigger\n");
-		err = -EINVAL;
-		break;
+		return -EINVAL;
 	}
-	spin_unlock(&cs5535au->reg_lock);
-	return err;
+	return 0;
 }
 
 static snd_pcm_uframes_t snd_cs5535audio_pcm_pointer(struct snd_pcm_substream