mlxsw: spectrum: Align the matchall default case returned value

Align the default case for matchall offload with what's there
for flower.
Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
Acked-by: NYotam Gigi <yotamg@mellanox.com>
Signed-off-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

@@ -1423,7 +1423,7 @@ static int mlxsw_sp_setup_tc(struct net_device *dev, u32 handle,
 						       tc->cls_mall);
 			return 0;
 		default:
-			return -EINVAL;
+			return -EOPNOTSUPP;
 		}
 	case TC_SETUP_CLSFLOWER:
 		switch (tc->cls_flower->command) {