[patch] [media] cx231xx: dereferencing NULL after allocation failure

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

Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

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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