Only log the period mean if we have samples
authorJens Axboe <axboe@kernel.dk>
Thu, 1 Dec 2011 14:17:24 +0000 (15:17 +0100)
committerJens Axboe <axboe@kernel.dk>
Thu, 1 Dec 2011 14:17:24 +0000 (15:17 +0100)
We can't use the mean value to determine that, it could in theory
be 0.0 and still have valid samples.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

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