i40e: always set ks->base.speed in i40e_get_settings_link_up

In i40e_get_settings_link_up, set ks->base.speed to SPEED_UNKNOWN
in the case where we don't know the link speed.
Signed-off-by: NJacob Keller <jacob.e.keller@intel.com>
Tested-by: NAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_ethtool.c

@@ -906,6 +906,7 @@ static void i40e_get_settings_link_up(struct i40e_hw *hw,
 		ks->base.speed = SPEED_100;
 		break;
 	default:
+		ks->base.speed = SPEED_UNKNOWN;
 		break;
 	}
 	ks->base.duplex = DUPLEX_FULL;