[PATCH] Fix ugen multiple panics and detach race conditions

Sending to -current for a little more exposure.

I've updated my ugen patch again.  It now adds support for select() on 
writes and fixes the detach select() panic.

http://am-productions.biz/docs/ugen-multiple-panics.patch

The patch should fix ALL outstanding ugen panic PRs.

Would a commiter please take a look at these changes.  They are 
applicable to CURRENT, RELENG_6, and RELENG_5.  A few of the changes 
are also applicable to NetBSD and OpenBSD too.

Thanks,

-- 
Anish Mistry