mlxsw: spectrum: Fix error return code in mlxsw_sp_port_module_info_init()

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

Fixes: 4a7f970f ("mlxsw: spectrum: Replace port_to_module array with array of structs")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -4079,8 +4079,10 @@ static int mlxsw_sp_port_module_info_init(struct mlxsw_sp *mlxsw_sp)
 		mlxsw_sp->port_mapping[i] = kmemdup(&port_mapping,
 						    sizeof(port_mapping),
 						    GFP_KERNEL);
-		if (!mlxsw_sp->port_mapping[i])
+		if (!mlxsw_sp->port_mapping[i]) {
+			err = -ENOMEM;
 			goto err_port_module_info_dup;
+		}
 	}
 	return 0;