kern/109815: wrong interface identifier at pfil_hooks for vlans + if_bridge

[Eygene Ryabinkin]

> Here it is. I'll check it for compilation this evening and I hope Eygene will 
> be able to put it in a production for testings.

The system with 6.2 and this patch is living since yesterday. No problems
were spotted. I will try to put this patch into another, busier system,
but this will not be the same patch: my own one will be applied
on top of it. So this will not be the clear testcase.
-- 
Eygene