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Similarly to r301505 protect the removal of the ifa from the if_addrhead

Description

Similarly to r301505 protect the removal of the ifa from the if_addrhead
by a lock (as well as the check that the list is not empty).

Obtained from: projects/vnet
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation

Details

Provenance
bzAuthored on
Parents
rS301513: indent(1): Fix typo.
Branches
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