[Lwt.choose] do not leak memory anymore
[Lwt.choose] do not leak memory anymore

Ignore-this: 378fb9867686255e84384320a0b0d950

When a choose terminates, it removes all unneeded waiters.

darcs-hash:20090413144222-c41ad-56054431bf55a565f89f16b8a562eda6214aeb7c.gz

avsm/lwt-OLD,avsm/lwt-OLD