can: flexcan: flexcan_exit_stop_mode(): remove stray empty line

This patch removes a stray empty line from the flexcan_exit_stop_mode()
function.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/r/20200922144429.2613631-3-mkl@pengutronix.de