hwrng: exynos - make use of devm_hwrng_register

This allows us to get rid of remove() method.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/char/hw_random/exynos-rng.c

@@ -131,16 +131,7 @@ static int exynos_rng_probe(struct platform_device *pdev)
 	pm_runtime_use_autosuspend(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 
-	return hwrng_register(&exynos_rng->rng);
-}
-
-static int exynos_rng_remove(struct platform_device *pdev)
-{
-	struct exynos_rng *exynos_rng = platform_get_drvdata(pdev);
-
-	hwrng_unregister(&exynos_rng->rng);
-
-	return 0;
+	return devm_hwrng_register(&pdev->dev, &exynos_rng->rng);
 }
 
 #ifdef CONFIG_PM
@@ -172,7 +163,6 @@ static struct platform_driver exynos_rng_driver = {
 		.pm	= &exynos_rng_pm_ops,
 	},
 	.probe		= exynos_rng_probe,
-	.remove		= exynos_rng_remove,
 };
 
 module_platform_driver(exynos_rng_driver);