Simplify last loop in avg, avg_zero
Simplify last loop in avg, avg_zero

replay/metrictank,replay/metrictank,raintank/metrictank,raintank/metrictank,replay/metrictank,replay/metrictank,raintank/metrictank,raintank/raintank-metric,raintank/metrictank,raintank/raintank-metric,raintank/raintank-metric