net: sgi: ioc3-eth: remove checkpatch errors/warning

Before massaging the driver further fix oddities found by checkpatch like
- wrong indention
- comment formatting
- use of printk instead or netdev_xxx/pr_xxx

Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>