can: kvaser_pciefd: Change return type for kvaser_pciefd_{receive,transmit,set_tx}_irq()

Change return type to void for kvaser_pciefd_transmit_irq(),
kvaser_pciefd_receive_irq() and kvaser_pciefd_set_tx_irq().
These functions always return zero.

Signed-off-by: Jimmy Assarsson <extja@kvaser.com>
Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://lore.kernel.org/all/20230529134248.752036-10-extja@kvaser.com


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