mfd: Convert s5m core driver to use devm_kzalloc()

Convert s5m core driver to use devm_kzalloc().

Signed-off-by: Sangbeom Kim <sbkim73@samsung.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/s5m-core.c

diff --git a/drivers/mfd/s5m-core.c b/drivers/mfd/s5m-core.c
index caadabe..7585398 100644
--- a/drivers/mfd/s5m-core.c
+++ b/drivers/mfd/s5m-core.c
@@ -77,7 +77,8 @@
 	int ret = 0;
 	int error;
 
-	s5m87xx = kzalloc(sizeof(struct s5m87xx_dev), GFP_KERNEL);
+	s5m87xx = devm_kzalloc(&i2c->dev, sizeof(struct s5m87xx_dev),
+				GFP_KERNEL);
 	if (s5m87xx == NULL)
 		return -ENOMEM;
 
@@ -126,7 +127,6 @@
 	s5m_irq_exit(s5m87xx);
 	i2c_unregister_device(s5m87xx->rtc);
 	regmap_exit(s5m87xx->regmap);
-	kfree(s5m87xx);
 	return ret;
 }
 
@@ -138,7 +138,6 @@
 	s5m_irq_exit(s5m87xx);
 	i2c_unregister_device(s5m87xx->rtc);
 	regmap_exit(s5m87xx->regmap);
-	kfree(s5m87xx);
 	return 0;
 }