fixup! fix: smooth progress bar for backup transfer

src/imex.rs

@@ -302,16 +302,12 @@ struct ProgressReader<R> {
     #[pin]
     inner: R,
 
-    #[pin]
     read: usize,
 
-    #[pin]
     file_size: usize,
 
-    #[pin]
     last_progress: usize,
 
-    #[pin]
     context: Context,
 }
 
@@ -336,7 +332,7 @@ where
         cx: &mut std::task::Context<'_>,
         buf: &mut ReadBuf<'_>,
     ) -> std::task::Poll<std::io::Result<()>> {
-        let mut this = self.project();
+        let this = self.project();
         let before = buf.filled().len();
         let res = this.inner.poll_read(cx, buf);
         if let std::task::Poll::Ready(Ok(())) = res {
@@ -514,16 +510,12 @@ struct ProgressWriter<W> {
     #[pin]
     inner: W,
 
-    #[pin]
     written: usize,
 
-    #[pin]
     file_size: usize,
 
-    #[pin]
     last_progress: usize,
 
-    #[pin]
     context: Context,
 }
 
@@ -548,7 +540,7 @@ where
         cx: &mut std::task::Context<'_>,
         buf: &[u8],
     ) -> std::task::Poll<Result<usize, std::io::Error>> {
-        let mut this = self.project();
+        let this = self.project();
         let res = this.inner.poll_write(cx, buf);
         if let std::task::Poll::Ready(Ok(written)) = res {
             *this.written = this.written.saturating_add(written);