✘NMEA/PPS driver #20 fix for issue #62

[Gary E. Miller]

Yo All!

I have a provisional fix for issue #62:

https://gitlab.com/NTPsec/ntpsec/issues/62

In the NMEA refclock (#20), when PPS is lost, the peer jitter was left
at the low value calculated for PPS.  This jitter is then used for NMEA.
So the NMEA time is wrongly thought to be PPS precise.  This caused the
selection algorithm to wrongly pick NMEA over other better sources.

The fix is to reset the jitter for the refclock to default when PPS is
lost.

A try at a fix is in commit 7d49f80d

If you are using the NMEA driver with PPS, please test.  I'll also
test.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at rellim.com  Tel:+1 541 382 8588

	    Veritas liberabit vos. -- Quid est veritas?
    "If you can’t measure it, you can’t improve it." - Lord Kelvin
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