net/mlx4_core: Change the error print to info print

The error print within mlx4_flow_steer_promisc_add() should
be a info print.

Fixes: 592e49dd ('net/mlx4: Implement promiscuous mode with device managed flow-steering')
Signed-off-by: NYunjian Wang <wangyunjian@huawei.com>
Reviewed-by: NTariq Toukan <tariqt@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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

@@ -1492,7 +1492,7 @@ int mlx4_flow_steer_promisc_add(struct mlx4_dev *dev, u8 port,
 	rule.port = port;
 	rule.qpn = qpn;
 	INIT_LIST_HEAD(&rule.list);
-	mlx4_err(dev, "going promisc on %x\n", port);
+	mlx4_info(dev, "going promisc on %x\n", port);
 
 	return  mlx4_flow_attach(dev, &rule, regid_p);
 }