TTY: If parsing speed argument fails, do NOT default to B38400
TTY: If parsing speed argument fails, do NOT default to B38400

If the speed argument to the `tty` stanza is invalid we should not
default to some other random speed.  Instead, leave the line speed
as-is, like we do when starting an external getty.

Signed-off-by: Joachim Nilsson <583c295fd7602c168ad814279bbc3894ba65f5d6@gmail.com>

troglobit/finit,troglobit/finit