Fix a bug in r214049. The nvp == vp case shall be handled specially only for !usevget case. If VFS_VGET is working, the vnode shared lock is obtained recursively and vput() shall be done, not vunref().
Fix a bug in r214049. The nvp == vp case shall be handled specially
only for !usevget case. If VFS_VGET is working, the vnode shared lock
is obtained recursively and vput() shall be done, not vunref().

Submitted by:	rmacklem
Tested by:	Josh Carroll <josh.carroll gmail com>
MFC after:	3 days

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