Staging: lustre: llite: Use () around long macro

This patch fixes the following checkpatch.pl
error: "Macros with complex values should be enclosed
in parentheses."

Signed-off-by: Tina Ruchandani <ruchandani.tina@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>