tools: fixing a division-by-zero
tools: fixing a division-by-zero

StanfordLegion/legion,StanfordLegion/legion,chuckatkins/legion,StanfordLegion/legion,StanfordLegion/legion,chuckatkins/legion,chuckatkins/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,sdalton1/legion,chuckatkins/legion,StanfordLegion/legion,sdalton1/legion,chuckatkins/legion,sdalton1/legion,sdalton1/legion,sdalton1/legion,sdalton1/legion,chuckatkins/legion,chuckatkins/legion