change CopyBothDuplex::finish: take self by value

Author: sharnoff

tokio-postgres/src/copy_both.rs

@@ -151,7 +151,8 @@ where
     ///
     /// The `Sink::close` method is equivalent to `finish`, except that it does not return the
     /// number of rows.
-    pub async fn finish(mut self: Pin<&mut Self>) -> Result<u64, Error> {
+    pub async fn finish(mut self) -> Result<u64, Error> {
+        let pinned = Pin::new(&mut self);
         future::poll_fn(|cx| self.as_mut().poll_finish(cx)).await
     }