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

Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/media/video/cx231xx/cx231xx-cards.c 
b/drivers/media/video/cx231xx/cx231xx-cards.c
index 919ed77..875a7ce 100644
--- a/drivers/media/video/cx231xx/cx231xx-cards.c
+++ b/drivers/media/video/cx231xx/cx231xx-cards.c
@@ -1052,7 +1052,7 @@ static int cx231xx_usb_probe(struct usb_interface 
*interface,
        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;
        }
 
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