Revert "Update src/sys/unix/waker.rs"

This reverts commit f5d912e.

src/sys/unix/waker.rs

@@ -128,6 +128,7 @@ mod eventfd {
         }
 
         /// Reset the eventfd object, only need to call this if `wake` fails.
+        #[allow(clippy::unused_io_amount)] // Don't care about partial reads.
         fn reset(&self) -> io::Result<()> {
             let mut buf: [u8; 8] = 0u64.to_ne_bytes();
             match (&self.fd).read(&mut buf) {