JGRP-2388 DNS_PING#destroy could yield NPE hiding the root cause
JGRP-2388 DNS_PING#destroy could yield NPE hiding the root cause

rhusar/JGroups,rhusar/JGroups,pferraro/JGroups,belaban/JGroups,pferraro/JGroups,rhusar/JGroups,belaban/JGroups,pferraro/JGroups,belaban/JGroups