can: kvaser_usb: Update stats and state even if alloc_can_err_skb() fails

Ensure statistics, error counters, and CAN state are updated consistently,
even when alloc_can_err_skb() fails during state changes or error message
frame reception.

Signed-off-by: Jimmy Assarsson <extja@kvaser.com>
Link: https://patch.msgid.link/20241230142645.128244-1-extja@kvaser.com


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