[issue1311] Assertion on spin_unlock_wr_quick

[Alex Hornung (via DragonFly issue tracker)]

Alex Hornung <ahornung at 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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