rtc: hid-sensor-time: remove some dead code

devm_rtc_device_register() doesn't ever return NULL so there is no need
to check.

Signed-off-by: Dan Carpenter <[e-mail]>
Signed-off-by: Alexandre Belloni <[e-mail]>

drivers/rtc/rtc-hid-sensor-time.c

···
 					"hid-sensor-time", &hid_time_rtc_ops,
 					THIS_MODULE);
 
-	if (IS_ERR_OR_NULL(time_state->rtc)) {
+	if (IS_ERR(time_state->rtc)) {
 		hid_device_io_stop(hsdev->hdev);
-		ret = time_state->rtc ? PTR_ERR(time_state->rtc) : -ENODEV;
+		ret = PTR_ERR(time_state->rtc);
 		time_state->rtc = NULL;
 		dev_err(&pdev->dev, "rtc device register failed!\n");
 		goto err_rtc;