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Prevent multicast code from panicing due to unprotected access to INADDR_HASH.

Description

Prevent multicast code from panicing due to unprotected access to INADDR_HASH.

PR: 220078
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D12457
Tested-by: Cassiano Peixoto and others

Details