net: sched: red: remove unnecessary red_dump_offload_stats parameter

Offload dump helper does not use opt parameter, remove it.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: John Hurley <john.hurley@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>