correct number of iterations

In all these cases the iterations counter is counting up from zero up to the
iteration count, so there is no need to reduce `iterations` by 1.

BUG=none
TEST=add some debug prints show expected number of iterations

Change-Id: Id5dd9025157fb29d2b4924eecb4ec74776bf6a9c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/glbench/+/2775408
Reviewed-by: Ilja H. Friedel <ihf@chromium.org>
Commit-Queue: Ilja H. Friedel <ihf@chromium.org>
Tested-by: Ilja H. Friedel <ihf@chromium.org>
5 files changed