do not wait if not needed in Lwt_bytes.wait_mincore
do not wait if not needed in Lwt_bytes.wait_mincore

Ignore-this: ffe5aa53d6de88ac9006e73bcc879c53

darcs-hash:20101125154526-c41ad-98ef603d8ba0bbee19700039ab9006d9876f847d

c-cube/lwt,fdopen/lwt,rgrinberg/lwt,c-cube/lwt,mfp/lwt,c-cube/lwt,fdopen/lwt,gfxmonk/lwt,rneswold/lwt,rgrinberg/lwt,rgrinberg/lwt,rgrinberg/lwt,ocsigen/lwt,ocsigen/lwt,mfp/lwt,gfxmonk/lwt,rneswold/lwt,janestreet/lwt-async,mirage/lwt,mirage/lwt,rneswold/lwt,ocsigen/lwt,janestreet/lwt-async