staging: lustre: namei.c: Fix trailing whitespace

This patch fixes a trailing whitespace in namei.c
Signed-off-by: NLaure Millet <laure.millet@lip6.fr>
Signed-off-by: NMaxime Lorrillere <maxime.lorrillere@lip6.fr>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>