can: kvaser_usb: kvaser_usb_send_cmd(): remove redundant variable actual_len

The function usb_bulk_msg() can be called with a NULL pointer as the
"actual_length" parameter. This patch removes this variable.

Link: https://lore.kernel.org/all/20220124215642.3474154-9-mkl@pengutronix.de


Cc: Jimmy Assarsson <extja@kvaser.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>