stop polling if linux device is disconnected #79
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Currently, when a HID device is disconnected,
linux.HidDevice#runReadOnBackground()gets stuck in an infinite loop.The reason is that
poll()always implicitly polles for eventsPOLLERR | POLLHUP | POLLNVAL, which are not handled in the loop.To fix this, I've added a
breakfor the case thatpoll()returnes withoutPOLLIN.