can: gs_usb: gs_cmd_reset(): remove unused parameter "struct gs_usb *gsusb"

The 2nd parameter of gs_cmd_reset() "struct gs_usb *gsusb" is unused, so
remove it.

Suggested-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>