staging: lustre: fix assorted checkpatch errors

Possibly the most interesting is the for-loop with no body.
Rearranging and initializing end_dirent on each iteration of
the outer while, makes the intent clearer.

Reviewed-by: "Eremin, Dmitry" <dmitry.eremin@intel.com>
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>