Stop reading socket once descriptor is closed #86
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https://github.com/utxostack/rust-lightning/blob/bdbfd070a10f46653c396788ffc49e6cb6ebb00f/lightning/src/ln/peer_handler.rs#L1574
read_eventmay return an error to indicate disconnect socket. But in the current implementation, we ignored this behavior and continue to read the 'closed' descriptor. to fix it, we simply stop reading a closed descriptor.