Jung-uk Kim 9fee1bd1d8 Tidy up callout for select(2) and read timeout.
- Add a missing callout_drain(9) before the descriptor deallocation.[1]
- Prefer callout_init_mtx(9) over callout_init(9) and let the callout
subsystem handle the mutex for callout function.

PR:		kern/144453
Submitted by:	Alexander Sack (asack at niksun dot com)[1]
MFC after:	1 week
2010-03-12 19:14:58 +00:00
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