Silence clippy::unused_io_amount in various places

Way too many false positives.

examples/tcp_listenfd_server.rs

@@ -132,6 +132,7 @@ fn handle_connection_event(
 ) -> io::Result<bool> {
     if event.is_writable() {
         // We can (maybe) write to the connection.
+        #[allow(clippy::unused_io_amount)]
         match connection.write(DATA) {
             // We want to write the entire `DATA` buffer in a single go. If we
             // write less we'll return a short write error (same as

src/sys/unix/waker.rs

@@ -102,6 +102,7 @@ mod eventfd {
 
         pub fn wake(&self) -> io::Result<()> {
             let buf: [u8; 8] = 1u64.to_ne_bytes();
+            #[allow(clippy::unused_io_amount)]
             match (&self.fd).write(&buf) {
                 Ok(_) => Ok(()),
                 Err(ref err) if err.kind() == io::ErrorKind::WouldBlock => {
@@ -122,6 +123,7 @@ mod eventfd {
         /// Reset the eventfd object, only need to call this if `wake` fails.
         fn reset(&self) -> io::Result<()> {
             let mut buf: [u8; 8] = 0u64.to_ne_bytes();
+            #[allow(clippy::unused_io_amount)]
             match (&self.fd).read(&mut buf) {
                 Ok(_) => Ok(()),
                 // If the `Waker` hasn't been awoken yet this will return a

tests/tcp.rs

@@ -621,6 +621,7 @@ fn write_error() {
 
     let buf = [0; 1024];
     loop {
+        #[allow(clippy::unused_io_amount)]
         match s.write(&buf) {
             Ok(_) => {}
             Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => wait_writable(),