gfs2: Don't try to sync non-changes

Function need_sync is supposed to determine if a qd element needs to be
synced. If the "change" (qd_change) is zero, it does not need to be
synced because there's literally no change in the value. Before this
patch need_sync returned false if value < 0. That should be <= 0.
This patch changes the check to <=.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

fs/gfs2/quota.c

@@ -1126,7 +1126,7 @@ static bool need_sync(struct gfs2_quota_data *qd)
 	den = gt->gt_quota_scale_den;
 	spin_unlock(&gt->gt_spin);
 
-	if (value < 0)
+	if (value <= 0)
 		return false;
 	else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
 		 (s64)be64_to_cpu(qd->qd_qb.qb_limit))