net/mlx5: Fix error return code in esw_qos_create()

Fix to return a negative error code from the error handling
case instead of 0, as done elsewhere in this function.

Fixes: 85c5f7c9 ("net/mlx5: E-switch, Create QoS on demand")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/esw/qos.c

@@ -590,6 +590,7 @@ static int esw_qos_create(struct mlx5_eswitch *esw, struct netlink_ext_ack *exta
 		if (IS_ERR(esw->qos.group0)) {
 			esw_warn(dev, "E-Switch create rate group 0 failed (%ld)\n",
 				 PTR_ERR(esw->qos.group0));
+			err = PTR_ERR(esw->qos.group0);
 			goto err_group0;
 		}
 	}