can: at91_can: use DEVICE_ATTR_RW() helper macro

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

Link: https://lore.kernel.org/r/20210603100233.11877-1-thunder.leizhen@huawei.comSigned-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/at91_can.c

@@ -1176,7 +1176,7 @@ static const struct net_device_ops at91_netdev_ops = {
 	.ndo_change_mtu = can_change_mtu,
 };
 
-static ssize_t at91_sysfs_show_mb0_id(struct device *dev,
+static ssize_t mb0_id_show(struct device *dev,
 			   struct device_attribute *attr, char *buf)
 {
 	struct at91_priv *priv = netdev_priv(to_net_dev(dev));
@@ -1187,7 +1187,7 @@ static ssize_t at91_sysfs_show_mb0_id(struct device *dev,
 		return snprintf(buf, PAGE_SIZE, "0x%03x\n", priv->mb0_id);
 }
 
-static ssize_t at91_sysfs_set_mb0_id(struct device *dev,
+static ssize_t mb0_id_store(struct device *dev,
 			    struct device_attribute *attr, const char *buf, size_t count)
 {
 	struct net_device *ndev = to_net_dev(dev);
@@ -1222,7 +1222,7 @@ static ssize_t at91_sysfs_set_mb0_id(struct device *dev,
 	return ret;
 }
 
-static DEVICE_ATTR(mb0_id, 0644, at91_sysfs_show_mb0_id, at91_sysfs_set_mb0_id);
+static DEVICE_ATTR_RW(mb0_id);
 
 static struct attribute *at91_sysfs_attrs[] = {
 	&dev_attr_mb0_id.attr,