staging: lustre: remove space between function name and open parenthesis

This fixes the following checkpatch.pl warnings:

WARNING: space prohibited between function name and open parenthesis '('

Signed-off-by: Teodora Baluta <teobaluta@gmail.com>
Reviewed-by: Lisa Nguyen <lisa@xenapiadmin.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>