Staging: lustre: libcfs: Fix switch-case indent

This patch fixes the following checkpatch error:j
ERROR: switch and case should be at the same indent
105: FILE: drivers/staging/lustre/lustre/libcfs/fail.c:105:
Signed-off-by: Tina Ruchandani <ruchandani.tina@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>