Upcoming changes on slcan driver will require you to specify a bitrate
of value -1 to prevent the open_candev() from failing but at the same
time highlighting that it is a fake value. In this case the command
`ip --details -s -s link show' would print 4294967295 as the bitrate
value. The patch change this value in 0.

Link: https://lore.kernel.org/all/20220628163137.413025-5-dario.binacchi@amarulasolutions.comSuggested-by: NMarc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: NDario Binacchi <dario.binacchi@amarulasolutions.com>
Tested-by: NJeroen Hofstee <jhofstee@victronenergy.com>
Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>