ALSA: line6: Drop superfluous irqsave/irqrestore in PCM trigger callback

The PCM trigger callback is guaranteed to be called already in
spinlock / irq-disabled context.
Tested-by: Chris Rorvick <chris@rorvick.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/line6/pcm.c

@@ -227,9 +227,8 @@ int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd)
 	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 	struct snd_pcm_substream *s;
 	int err;
-	unsigned long flags;
 
-	spin_lock_irqsave(&line6pcm->lock_trigger, flags);
+	spin_lock(&line6pcm->lock_trigger);
 	clear_bit(LINE6_INDEX_PREPARED, &line6pcm->flags);
 
 	snd_pcm_group_for_each_entry(s, substream) {
@@ -240,8 +239,7 @@ int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd)
 			err = snd_line6_playback_trigger(line6pcm, cmd);
 
 			if (err < 0) {
-				spin_unlock_irqrestore(&line6pcm->lock_trigger,
-						       flags);
+				spin_unlock(&line6pcm->lock_trigger);
 				return err;
 			}
 
@@ -251,8 +249,7 @@ int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd)
 			err = snd_line6_capture_trigger(line6pcm, cmd);
 
 			if (err < 0) {
-				spin_unlock_irqrestore(&line6pcm->lock_trigger,
-						       flags);
+				spin_unlock(&line6pcm->lock_trigger);
 				return err;
 			}
 
@@ -264,7 +261,7 @@ int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd)
 		}
 	}
 
-	spin_unlock_irqrestore(&line6pcm->lock_trigger, flags);
+	spin_unlock(&line6pcm->lock_trigger);
 	return 0;
 }