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Always use inp fib in the inp_lookup_mcast_ifp().
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Authored by melifaro on Apr 5 2021, 7:59 PM.

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Summary

inp_lookup_mcast_ifp() is static and is only used in the inp_join_group().
The latter function is also static, and is only used in the inp_setmoptions(), which relies on inp being non-NULL.

As a result, in the current code, inp_lookup_mcast_ifp() is always called with non-NULL inp.
Eliminate unused RT_DEFAULT_FIB condition and always use inp fib instead.

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R10 FreeBSD src repository
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