if_tap VIMAGE support

Hi all,

I have been experimenting with a VIMAGE kernel and noticed that it can be 
panic()'d by opening and closing an if_tap device. I've submitted a PR with a 
possible patch as kern/158686 .

Could anyone have a look at it?


Thanks,
--
Daan Vreeken
Vitsch Electronics
http://Vitsch.nl
tel: +31-(0)40-7113051 / +31-(0)6-46210825
KvK nr: 17174380