staging/lustre: Remove unneeded {} in lprocfs_stats_unlock()

Since there's only one call in those if () else branches, the
braces are not really necessary.

Highlighted by checkpatch.

Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>