melifaro ebd6d5fb37 Use fib[46]_lookup() in mtu calculations.
fib[46]_lookup_nh_ represents pre-epoch generation of fib api,
providing less guarantees over pointer validness and requiring
on-stack data copying.

Conversion is straight-forwarded, as the only 2 differences are
requirement of running in network epoch and the need to handle
RTF_GATEWAY case in the caller code.

Differential Revision:	https://reviews.freebsd.org/D24974
2020-05-28 08:00:08 +00:00
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