can: kvaser_pciefd: Add unlikely

Use unlikely for some unexpected errors.

Signed-off-by: Martin Jocic <martin.jocic@kvaser.com>
Link: https://lore.kernel.org/all/20240614151524.2718287-6-martin.jocic@kvaser.com


Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>