Eric van Gyzen edf0313b70 Fix garbage IP addresses in UDP log_in_vain messages
If multiple threads emit a UDP log_in_vain message concurrently,
the IP addresses could be garbage due to concurrent usage of a
single string buffer inside inet_ntoa().  Use inet_ntoa_r() with
two stack buffers instead.

Reported by:	Mark Martinec <Mark.Martinec+freebsd@ijs.si>
MFC after:	3 days
Relnotes:	yes
Sponsored by:	Dell EMC
2017-02-07 18:57:57 +00:00
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