[pcp] QA: pmval showing one less sample

[Nathan Scott]

----- "Nathan Scott" <nscott at aconex.com> wrote:
> 
> Anyway, attached patch fixes test case 125, which is a simple test
> case for this.  Some of the other QA tests now fail, like 261 - the
> sample.drift bit fails though, which is an instantaneous metric,
> showing we used to go down the wrong pmval code path in that case.

Attached patch addresses most of the fallout so far... some remain
and are less clearcut though, needing even more careful checking.

cheers.

-- 
Nathan
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