staging: lustre: Fixed the parenthesis

The parentehsis are fixed in the macro for the ldlm lock to set and
clear the flags.

Signed-off-by: Shalin Mehta <shalinmehta85@gmail.com>
Acked-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>