net/mlx4: Use ARRAY_SIZE to get an array's size

The ARRAY_SIZE macro is defined to get an array's size which is
more compact and more formal in linux source. Thus, we can replace
the long sizeof(arr)/sizeof(arr[0]) with the compact ARRAY_SIZE.
Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://lore.kernel.org/r/20210817121106.44189-1-wangborong@cdjrlc.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlx4/qp.c

@@ -739,7 +739,7 @@ static void mlx4_cleanup_qp_zones(struct mlx4_dev *dev)
 		int i;
 
 		for (i = 0;
-		     i < sizeof(qp_table->zones_uids)/sizeof(qp_table->zones_uids[0]);
+		     i < ARRAY_SIZE(qp_table->zones_uids);
 		     i++) {
 			struct mlx4_bitmap *bitmap =
 				mlx4_zone_get_bitmap(qp_table->zones,