Fix two vnode locking problems in nfsd_recalldelegation() in the experimental NFSv4 server. The first was a bogus use of VOP_ISLOCKED() in a KASSERT() and the second was the need to lock the vnode for the nfsrv_checkremove() call. Also, delete a "__unused" that was bogus, since the argument is used.
Fix two vnode locking problems in nfsd_recalldelegation() in the
experimental NFSv4 server. The first was a bogus use of VOP_ISLOCKED()
in a KASSERT() and the second was the need to lock the vnode for the
nfsrv_checkremove() call. Also, delete a "__unused" that was bogus,
since the argument is used.

Reviewed by:	zack.kirsch at isilon.com
MFC after:	2 weeks

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