NET-195 - fix incorrect double-checked locking
NET-195 - fix incorrect double-checked locking

git-svn-id: a30623744da1fa54a2e05f6887273b2822fd1c7c@645324 13f79535-47bb-0310-9956-ffa450edef68

apache/commons-net,codolutions/commons-net,codolutions/commons-net,mohanaraosv/commons-net,apache/commons-net,mohanaraosv/commons-net