services.hostapd: convert iwd assertion ito an warning (#445760)

        # we check if wirelessInterfaces is empty as that means all interfaces implicit

        shouldWarn = wirelessEnabled && (wirelessInterfaces == [ ] || hasInterfaceConflict);

      in

      if shouldWarn then

        [

          ''

      lib.optional shouldWarn ''

        Some wireless interface is configured for both for client and access point mode:

        this is not allowed. Either specify `networking.wireless.interfaces` and exclude

        those from `services.hostapd.radios` or make sure to not run the `wpa_supplicant`

        and `hostapd` services simultaneously.

      ''

        ]

      else

        [ ];

      ++ lib.optional config.networking.wireless.iwd.enable ''

        hostapd and iwd do conflict,

        use `networking.wireless.enable` in combination with `networking.wireless.interfaces` to avoid it.

      '';

    assertions = [

      {

        assertion = cfg.radios != { };

        message = "At least one radio must be configured with hostapd!";

      }

      {

        assertion = !config.networking.wireless.iwd.enable;

        message = "hostapd and iwd conflict, use `networking.wireless.enable` in combination with `networking.wireless.interfaces`";

      }

    ]

    # Radio warnings

    ++ (concatLists (