Fix clippy::redundant_guards warning
``` warning: redundant guard --> src/io.rs:2701:28 | 2701 | Ok(buf) if buf.is_empty() => { | ^^^^^^^^^^^^^^ | = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_guards = note: `#[warn(clippy::redundant_guards)]` on by default help: try | 2701 - Ok(buf) if buf.is_empty() => { 2701 + Ok([]) => { | ```
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@ -2698,9 +2698,7 @@ impl<R1: AsyncBufRead, R2: AsyncBufRead> AsyncBufRead for Chain<R1, R2> {
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let this = self.project();
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if !*this.done_first {
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match ready!(this.first.poll_fill_buf(cx)) {
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Ok(buf) if buf.is_empty() => {
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*this.done_first = true;
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}
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Ok([]) => *this.done_first = true,
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Ok(buf) => return Poll::Ready(Ok(buf)),
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Err(err) => return Poll::Ready(Err(err)),
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}
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