ASoC: cs42l56: use DEVICE_ATTR_WO macro

Use DEVICE_ATTR_WO() helper instead of plain DEVICE_ATTR(),
which makes the code a bit shorter and easier to read.

Signed-off-by: YueHaibing <[e-mail]>
Reviewed-by: Charles Keepax <[e-mail]>
Message-Id: <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/codecs/cs42l56.c

···
 	return 0;
 }
 
-static ssize_t cs42l56_beep_set(struct device *dev,
-			       struct device_attribute *attr,
-			       const char *buf, size_t count)
+static ssize_t beep_store(struct device *dev, struct device_attribute *attr,
+			  const char *buf, size_t count)
 {
 	struct cs42l56_private *cs42l56 = dev_get_drvdata(dev);
 	long int time;
···
 	return count;
 }
 
-static DEVICE_ATTR(beep, 0200, NULL, cs42l56_beep_set);
+static DEVICE_ATTR_WO(beep);
 
 static void cs42l56_init_beep(struct snd_soc_component *component)
 {