Fix a LOR between allprison_lock and vnode locks by releasing allprison_lock before releasing a prison's root vnode.
Fix a LOR between allprison_lock and vnode locks by releasing
allprison_lock before releasing a prison's root vnode.

PR:		kern/138004
Reviewed by:	kib
Approved by:	bz (mentor)
MFC after:	3 days

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