Fix fmt in future write generics encoder.rs

Signed-off-by: Jiahao XU <[email protected]>

Author: NobodyXu

src/futures/write/generic/encoder.rs

@@ -87,9 +87,7 @@ impl<W: AsyncWrite, E: Encode> Encoder<W, E> {
                 }
 
                 State::Finishing | State::Done => {
-                    return Poll::Ready(Err(io::Error::other(
-                        "Write after close",
-                    )))
+                    return Poll::Ready(Err(io::Error::other("Write after close")))
                 }
             };
 
@@ -113,9 +111,7 @@ impl<W: AsyncWrite, E: Encode> Encoder<W, E> {
                 State::Encoding => this.encoder.flush(&mut output)?,
 
                 State::Finishing | State::Done => {
-                    return Poll::Ready(Err(io::Error::other(
-                        "Flush after close",
-                    )))
+                    return Poll::Ready(Err(io::Error::other("Flush after close")))
                 }
             };