clocksource: sh_mtu2: Remove unnecessary platform_set_drvdata()

The driver core clears the driver data to NULL after device_release
or on probe failure. Thus, it is not needed to manually clear the
device driver data to NULL.
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Acked-by: NSimon Horman <horms+renesas@verge.net.au>
Signed-off-by: NDaniel Lezcano <daniel.lezcano@linaro.org>

drivers/clocksource/sh_mtu2.c

@@ -346,7 +346,6 @@ static int sh_mtu2_probe(struct platform_device *pdev)
 	ret = sh_mtu2_setup(p, pdev);
 	if (ret) {
 		kfree(p);
-		platform_set_drvdata(pdev, NULL);
 		pm_runtime_idle(&pdev->dev);
 		return ret;
 	}