[PATCH v1 3/3] gpio: pca9570: use lock guards

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

Shrink the code by a couple lines and improve lock management by using
lock guards from cleanup.h.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/gpio/gpio-pca9570.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/gpio/gpio-pca9570.c b/drivers/gpio/gpio-pca9570.c
index a41837f1201b..4a368803fb03 100644
--- a/drivers/gpio/gpio-pca9570.c
+++ b/drivers/gpio/gpio-pca9570.c
@@ -10,6 +10,7 @@
  */
 
 #include <linux/bits.h>
+#include <linux/cleanup.h>
 #include <linux/device/devres.h>
 #include <linux/errno.h>
 #include <linux/gpio/driver.h>
@@ -98,7 +99,7 @@ static int pca9570_set(struct gpio_chip *chip, unsigned int offset, int value)
 	u8 buffer;
 	int ret;
 
-	mutex_lock(&gpio->lock);
+	guard(mutex)(&gpio->lock);
 
 	buffer = gpio->out;
 	if (value)
@@ -108,13 +109,11 @@ static int pca9570_set(struct gpio_chip *chip, unsigned int offset, int value)
 
 	ret = pca9570_write(gpio, buffer);
 	if (ret)
-		goto out;
+		return ret;
 
 	gpio->out = buffer;
 
-out:
-	mutex_unlock(&gpio->lock);
-	return ret;
+	return 0;
 }
 
 static int pca9570_probe(struct i2c_client *client)
-- 
2.50.1