Several FSs put/free the root node in unmount()
|Reported by:||bonefish||Owned by:||nobody|
At a quick glance several FSs (at least rootfs, devfs, bfs, reiserfs, maybe others) put or free their root node in their
unmount() hook. Since the VFS calls the
remove_vnode() hook for each node before calling
unmount(), all nodes have already been freed at that time, though.