leds: convert Atmel PWM LED driver to devm_kzalloc()

Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
diff --git a/drivers/leds/leds-atmel-pwm.c b/drivers/leds/leds-atmel-pwm.c
index 64ad702..4543063 100644
--- a/drivers/leds/leds-atmel-pwm.c
+++ b/drivers/leds/leds-atmel-pwm.c
@@ -46,7 +46,8 @@
 	if (!pdata || pdata->num_leds < 1)
 		return -ENODEV;
 
-	leds = kcalloc(pdata->num_leds, sizeof(*leds), GFP_KERNEL);
+	leds = devm_kzalloc(&pdev->dev, pdata->num_leds * sizeof(*leds),
+			GFP_KERNEL);
 	if (!leds)
 		return -ENOMEM;
 
@@ -108,7 +109,6 @@
 			pwm_channel_free(&leds[i].pwmc);
 		}
 	}
-	kfree(leds);
 
 	return status;
 }
@@ -129,7 +129,6 @@
 		pwm_channel_free(&led->pwmc);
 	}
 
-	kfree(leds);
 	platform_set_drvdata(pdev, NULL);
 	return 0;
 }