fix possible crash in get_cpu_instance
fix possible crash in get_cpu_instance


monicasarbu/sigar,OlegYch/sigar,scouter-project/sigar,couchbase/sigar,racker/sigar,hyperic/sigar,lsjeng/sigar,ruleless/sigar,formicary/sigar,OlegYch/sigar,abhinavmishra14/sigar,abhinavmishra14/sigar,racker/sigar,racker/sigar,boundary/sigar,abhinavmishra14/sigar,cit-lab/sigar,ruleless/sigar,OlegYch/sigar,cit-lab/sigar,ruleless/sigar,ruleless/sigar,ChunPIG/sigar,boundary/sigar,boundary/sigar,ChunPIG/sigar,formicary/sigar,racker/sigar,abhinavmishra14/sigar,lsjeng/sigar,formicary/sigar,OlegYch/sigar,lsjeng/sigar,formicary/sigar,kaustavha/sigar,hyperic/sigar,lsjeng/sigar,hyperic/sigar,OlegYch/sigar,ChunPIG/sigar,kaustavha/sigar,cit-lab/sigar,OlegYch/sigar,monicasarbu/sigar,monicasarbu/sigar,formicary/sigar,boundary/sigar,boundary/sigar,lsjeng/sigar,formicary/sigar,cit-lab/sigar,OlegYch/sigar,ChunPIG/sigar,cit-lab/sigar,cit-lab/sigar,ChunPIG/sigar,formicary/sigar,monicasarbu/sigar,kaustavha/sigar,ChunPIG/sigar,ruleless/sigar,formicary/sigar,monicasarbu/sigar,scouter-project/sigar,boundary/sigar,hyperic/sigar,formicary/sigar,OlegYch/sigar,boundary/sigar,boundary/sigar,formicary/sigar,lsjeng/sigar,lsjeng/sigar,kaustavha/sigar,kaustavha/sigar,scouter-project/sigar,scouter-project/sigar,couchbase/sigar,abhinavmishra14/sigar,hyperic/sigar,scouter-project/sigar,abhinavmishra14/sigar,kaustavha/sigar,ruleless/sigar,monicasarbu/sigar,ruleless/sigar,OlegYch/sigar,lsjeng/sigar,cit-lab/sigar,ChunPIG/sigar,hyperic/sigar,monicasarbu/sigar,kaustavha/sigar,cit-lab/sigar,ChunPIG/sigar,racker/sigar,racker/sigar,abhinavmishra14/sigar,boundary/sigar,monicasarbu/sigar,hyperic/sigar,OlegYch/sigar,kaustavha/sigar,monicasarbu/sigar,abhinavmishra14/sigar,cit-lab/sigar,kaustavha/sigar,racker/sigar,ruleless/sigar,abhinavmishra14/sigar,monicasarbu/sigar,abhinavmishra14/sigar,hyperic/sigar,boundary/sigar,monicasarbu/sigar,kaustavha/sigar,scouter-project/sigar,scouter-project/sigar,ChunPIG/sigar,cit-lab/sigar,lsjeng/sigar,hyperic/sigar,hyperic/sigar,racker/sigar,lsjeng/sigar,scouter-project/sigar,scouter-project/sigar,abhinavmishra14/sigar,racker/sigar,hyperic/sigar,scouter-project/sigar,racker/sigar,scouter-project/sigar,kaustavha/sigar,ruleless/sigar,ChunPIG/sigar,cit-lab/sigar,ruleless/sigar