drm/i915/selftests: Skip unstable timing measurements
If any of the perf tests run into 0 time, not only are we liable to divide by zero, but the result would be highly questionable. Nevertheless, let's not have a div-by-zero error. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Andi Shyti <andi.shyti@intel.com> Reviewed-by: Andi Shyti <andi.shyti@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210108204026.20682-2-chris@chris-wilson.co.uk
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