Dedup vnode type information. Fuse stores the vnode type in two places:

Dedup vnode type information. Fuse stores the vnode type in two places:
vtype in struct fusefs_node and v_type in struct vnode. Given the fact,
that fusefs_node structs are never allocated without an associated vnode
and those two fields are always in sync, one of those locations is
superfluous.

While there remove the unused nlookup field.

ok mpi