leds: convert LT3593 LED driver to devm_kzalloc()

Cc: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

drivers/leds/leds-lt3593.c

@@ -149,7 +149,8 @@ static int __devinit lt3593_led_probe(struct platform_device *pdev)
 	if (!pdata)
 		return -EBUSY;
 
-	leds_data = kzalloc(sizeof(struct lt3593_led_data) * pdata->num_leds,
+	leds_data = devm_kzalloc(&pdev->dev,
+			sizeof(struct lt3593_led_data) * pdata->num_leds,
 			GFP_KERNEL);
 	if (!leds_data)
 		return -ENOMEM;
@@ -169,8 +170,6 @@ static int __devinit lt3593_led_probe(struct platform_device *pdev)
 	for (i = i - 1; i >= 0; i--)
 		delete_lt3593_led(&leds_data[i]);
 
-	kfree(leds_data);
-
 	return ret;
 }
 
@@ -185,8 +184,6 @@ static int __devexit lt3593_led_remove(struct platform_device *pdev)
 	for (i = 0; i < pdata->num_leds; i++)
 		delete_lt3593_led(&leds_data[i]);
 
-	kfree(leds_data);
-
 	return 0;
 }