[issue1311] Assertion on spin_unlock_wr_quick

["Alex Hornung \(via DragonFly issue tracker\)" <sinknull@xxxxxxxxxxxxxxxxxxxxx>]

Alex Hornung <ahornung@gmail.com> added the comment:

I think this should be commited; it doesn't hurt and might avoid errors going by 
unnoticed related to decreasing the spinlock count further than allowed.

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priority:  -> feature
status: unread -> chatting

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