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The hdev->send driver callback is mandatory to be provided by a driver before calling hci_register_dev. So enforce it and return EINVAL in case it is not available. All existing drivers are providing this callback anyway, so this is just an extra sanity check. Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>