Miroslav Lichvar 73c548ad01 sourcestats: handle negative elapsed time in SST_GetSelectionData() ...

Source selection uses the last event time as current time. If it was
called from a refclock which generates a sample in its poll function
(e.g. PHC), the sample time may be later than the event time. This
gives a negative elapsed time in SST_GetSelectionData() and possibly
also a negative root distance, which causes the source to be rejected as
a falseticker.

Use absolute value of the difference in order to always get a positive
root distance.

2017-05-26 13:33:53 +02:00

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