korina: fix printk formatting, add final info line

The macro DRV_NAME contains "korina", the field dev->name points to the
actual interface name. So messages were formerly prefixed with
'korinaeth2:' (on my system).

Signed-off-by: Phil Sutter <n0-1@freewrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>