r260228:
Remove useless register variable modifiers.
Do some more style(9).
r260295:
Change semantics for rnh_lookup() function: now
it performs exact match search, regardless of netmask existance.
This simplifies most of rnh_lookup() consumers.
Fix panic triggered by deleting non-existent host route.
PR: kern/185092
Submitted by: Nikolay Denev <ndenev at gmail.com>