Get a vnode from the free list and increment its reference count.
vp The vnode to remove from the free list.
lockflag If non-zero, the vnode will also be locked.
When not in use, vnodes are kept on a free list. The vnodes still reference valid files but may be
reused to refer to a new file at any time. Often, these vnodes are also held in caches in the system,
such as the name cache.
When a vnode which is on the free list is used again, for instance if the vnode was found in the name
cache as a result of a call to VOP_LOOKUP(9) then the new user must call vget() to increment the
reference count and remove it from the free list.