Return from forEachLine

I have this method

private fun getDeviceType(): Device {
    ExecuteCommand().forEach {
        if (it == "my search string") {
            return Device.DEVICE_1
        }
    }
    return Device.UNKNOWN
}

where ExecuteCommand() actually does a cat file and returns a list of the file contents. So instead of executing a shell command, I changed it to

private fun getDeviceType(): Device {
    File(PATH).forEachLine {
        if (it == "my search string") {
            return Device.DEVICE_1
        }
    }
    return Device.UNKNOWN
}

But now compiler complains that return is not allowed here.

How can I exit from the closure?

The former example works because forEach is an inline method, while forEachLine is not. However, you can do this:

private fun getDeviceType(): Device {
    var device = Device.UNKNOWN
    File(PATH).forEachLine {
        if (it == "my search string") {
            device = Device.DEVICE_1
        }
    }
    return device
}