kib 4bd37f660a Use atomic_load(9) to read ppsinfo sequence numbers.
In this case volatile qualifiers enusre that a compiler does not
optimize the accesses out.

Reviewed by:	alc, jhb
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D13534
2017-12-19 10:05:45 +00:00
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