fixed a memory leak in traceroute primitive
fixed a memory leak in traceroute primitive

ben-jones/centinel,iclab/centinel,iclab/centinel,rpanah/centinel,rpanah/centinel,Ashish1805/centinel,lianke123321/centinel,rpanah/centinel,JASONews/centinel,lianke123321/centinel,iclab/centinel,lianke123321/centinel