ifa_refcnt clarification - do not IFAREF in in6_ifadd() (except on nbsd) - do not duplicate IFAFREE in in6_ifdel() (except on nbsd) without this, manually configured ifaddr will be freed two times when its lifetime expires. (fortunately, such a situation would be rare, but this change is still very important. be sure to update)
ifa_refcnt clarification
- do not IFAREF in in6_ifadd() (except on nbsd)
- do not duplicate IFAFREE in in6_ifdel() (except on nbsd)
without this, manually configured ifaddr will be freed two times when its
lifetime expires.
(fortunately, such a situation would be rare, but this change is still very
important. be sure to update)

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