svn commit: r282971 - in head/sys: kern sys

[Xin Li]

I think we should also assert that no waiter remains when a conditional
variable is destroyed (which also suggests that the memory may be freed
shortly).  Otherwise we would either have modify after free or lost wakeups.

Cheers,
-- 
Xin LI <delphij at delphij.net>    https://www.delphij.net/
FreeBSD - The Power to Serve!           Live free or die
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