vnode: Assert that VOP_LOCK succeeds in freevnode()
Reviewed by:	kib
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D52245
(cherry picked from commit a7aac8c20497d1666a15f160ef99acddd55a1365)
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vnode: Assert that VOP_LOCK succeeds in freevnode() Tags None Referenced Files None Subscribers None 
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