leds: convert Atmel PWM LED driver to devm_kzalloc()

Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

drivers/leds/leds-atmel-pwm.c

@@ -46,7 +46,8 @@ static int __devinit pwmled_probe(struct platform_device *pdev)
 	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 @@ err:
 			pwm_channel_free(&leds[i].pwmc);
 		}
 	}
-	kfree(leds);
 
 	return status;
 }
@@ -129,7 +129,6 @@ static int __exit pwmled_remove(struct platform_device *pdev)
 		pwm_channel_free(&led->pwmc);
 	}
 
-	kfree(leds);
 	platform_set_drvdata(pdev, NULL);
 	return 0;
 }