can: dev: add can_is_canfd_skb() API
The CAN device drivers can use can_is_canfd_skb() to check if the frame to send is on CAN FD mode or normal CAN mode. Acked-by: NOliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: NDong Aisheng <b29396@freescale.com> Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>
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