Removed unused test mod

Author: tglane

tokio-util/src/util/poll_buf.rs

@@ -143,15 +143,3 @@ pub fn poll_write_buf<T: AsyncWrite, B: Buf>(
 
     Poll::Ready(Ok(n))
 }
-
-#[cfg(test)]
-mod tests {
-
-    fn poll_read(
-        io: &mut (dyn tokio::io::AsyncRead + Unpin),
-        cx: &mut std::task::Context<'_>,
-        buf: &mut impl bytes::BufMut,
-    ) {
-        let _ = super::poll_read_buf(std::pin::Pin::new(io), cx, buf);
-    }
-}