rem: struct vnode *v;
add: struct vnode *vnode;
context: vfs_put_vnode(fs_id fsid, vnode_id vnid){	struct vnode *v;	mutex_lock(&vfs_vnode_mutex);	v = lookup_vnode(fsid, vnid);	mutex_unlock(&vfs_vnode_mutex);	if (v)		dec_vnode_ref_count(v, true, true);	return B_NO_ERROR;}