net/mlx5: E-Switch, Fix error flow in the SRIOV e-switch init code

When enablement of the SRIOV e-switch in certain mode (switchdev or legacy)
fails, we must set the mode to none. Otherwise, we'll run into double free
based crashes when further attempting to deal with the e-switch (such
as when disabling sriov or unloading the driver).
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx5/core/eswitch.c

@@ -1554,6 +1554,7 @@ int mlx5_eswitch_enable_sriov(struct mlx5_eswitch *esw, int nvfs, int mode)
 
 abort:
 	esw_enable_vport(esw, 0, UC_ADDR_CHANGE);
+	esw->mode = SRIOV_NONE;
 	return err;
 }