[GFS2] Fix GFS2's use of do_div() in its quota calculations

Fix GFS2's need_sync()'s use of do_div() on an s64 by using div_s64() instead.

This does assume that gt_quota_scale_den can be cast to an s32.

This was introduced by patch b3b94faa.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/quota.c

@@ -904,7 +904,7 @@ static int need_sync(struct gfs2_quota_data *qd)
 		do_sync = 0;
 	else {
 		value *= gfs2_jindex_size(sdp) * num;
-		do_div(value, den);
+		value = div_s64(value, den);
 		value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
 		if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 			do_sync = 0;