Fix compiler warning
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@ -10,7 +10,7 @@ use result::Result;
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use serde_json;
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use signature::PublicKey;
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use std::default::Default;
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use std::io::{ErrorKind, Write};
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use std::io::Write;
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use std::net::UdpSocket;
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use std::sync::atomic::{AtomicBool, Ordering};
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use std::sync::mpsc::channel;
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