kclient: fix r_locked_dir to match VFS locking
kclient: fix r_locked_dir to match VFS locking

Make sure r_locked_dir properly matches what the VFS is actually
doing.

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph