Move vn_fullpath1() outside of FILEDESC locking.  This is being done in advance of teaching vn_fullpath1() how to query file systems for vnode-to-name mappings when cache lookups fail.
Move vn_fullpath1() outside of FILEDESC locking.  This is being done in
advance of teaching vn_fullpath1() how to query file systems for
vnode-to-name mappings when cache lookups fail.

Thanks to kib for guidance and patience on this process.

Reviewed by:	kib
Approved by:	kib

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