benchstat: don't print geomean of just one benchmark
If there's just one benchmark, the geomean will be the same as the benchmark result. Omit it. Change-Id: Id165fa127aa8615015511d6a1da6e1be48b85539 Reviewed-on: https://go-review.googlesource.com/38093Reviewed-by: Quentin Smith <quentin@golang.org>
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