mfd: timberdale: Remove redundant assignment to variable err

The variable err is being assigned -ENODEV and then err is being
re-assigned the same error value via the error exit label err_mfd.
The assignment is redundant and can be removed.

Cleans up clang scan build warning:
drivers/mfd/timberdale.c:768:3: warning: Value stored to 'err' is
never read [deadcode.DeadStores]

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20240415102632.484411-1-colin.i.king@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>

Author: ColinIanKing

drivers/mfd/timberdale.c

@@ -765,7 +765,6 @@ static int timb_probe(struct pci_dev *dev,
 	default:
 		dev_err(&dev->dev, "Unknown IP setup: %d.%d.%d\n",
 			priv->fw.major, priv->fw.minor, ip_setup);
-		err = -ENODEV;
 		goto err_mfd;
 	}