Drop reference to timer callback on clearTimeout
Drop reference to timer callback on clearTimeout

Reported here:
http://groups.google.com/group/nodejs-dev/browse_thread/thread/9e063d0938f99879

Would be good to test this somehow...

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node