minor fix



git-svn-id: http://coturn.googlecode.com/svn/trunk@423 a3c88463-c8e2-e606-d8d5-275b8e57aef6
detached socket cleaning

git-svn-id: http://coturn.googlecode.com/svn/trunk@424 a3c88463-c8e2-e606-d8d5-275b8e57aef6