V4L/DVB (10456): radio-mr800: place dev_err instead of dev_warn

There should be dev_err message if video_register_device() fails.
Correct this situation.
Signed-off-by: Alexey Klimov <klimov.linux@gmail.com>
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/radio/radio-mr800.c

@@ -669,7 +669,7 @@ static int usb_amradio_probe(struct usb_interface *intf,
 	video_set_drvdata(radio->videodev, radio);
 	retval = video_register_device(radio->videodev,	VFL_TYPE_RADIO,	radio_nr);
 	if (retval < 0) {
-		dev_warn(&intf->dev, "could not register video device\n");
+		dev_err(&intf->dev, "could not register video device\n");
 		video_device_release(radio->videodev);
 		kfree(radio->buffer);
 		kfree(radio);