dsbr100: dev_err insted of dev_warn

diff -r 5fad9278bd8e linux/drivers/media/radio/dsbr100.c
@@ -670,7 +670,7 @@
 	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, "couldn't register video device\n");
 		kfree(radio->transfer_buffer);
 		kfree(radio);
 		return -EIO;