Konstantin Belousov cec9ed6d7f Lock the real null vnode lock before substitution of vp->v_vnlock.
This should not really matter for correctness, since vp->v_lock is
not locked before the call, and null_lock() holds the interlock,
but makes the control flow for reclaim more clear.

Tested by:	pho
2009-05-31 14:52:45 +00:00
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