can: dev: can_restart(): reverse logic to remove need for goto

Reverse the logic in the if statement and eliminate the need for a
goto to simplify code readability.

Link: https://lore.kernel.org/all/20231005-can-dev-fix-can-restart-v2-3-91b5c1fd922c@pengutronix.de


Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>