[media] cx231xx: dereferencing NULL after allocation failure

"dev" is NULL here so we should use "nr" instead of "dev->devno".

Signed-off-by: Dan Carpenter <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/video/cx231xx/cx231xx-cards.c

···
 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 	if (dev == NULL) {
 		cx231xx_err(DRIVER_NAME ": out of memory!\n");
-		clear_bit(dev->devno, &cx231xx_devused);
+		clear_bit(nr, &cx231xx_devused);
 		return -ENOMEM;
 	}