chore: remove unnecessary conversion (#1332)

tokio-fs/src/file/create.rs

@@ -35,6 +35,6 @@ where
         let std = ready!(crate::blocking_io(|| StdFile::create(&self.path)))?;
 
         let file = File::from_std(std);
-        Poll::Ready(Ok(file.into()))
+        Poll::Ready(Ok(file))
     }
 }

tokio-fs/src/file/metadata.rs

@@ -36,6 +36,6 @@ impl Future for MetadataFuture {
         let metadata = ready!(crate::blocking_io(|| StdFile::metadata(inner.std())))?;
 
         let file = inner.file.take().expect(POLL_AFTER_RESOLVE);
-        Poll::Ready(Ok((file, metadata).into()))
+        Poll::Ready(Ok((file, metadata)))
     }
 }

tokio-fs/src/file/open.rs

@@ -36,6 +36,6 @@ where
         let std = ready!(crate::blocking_io(|| self.options.open(&self.path)))?;
 
         let file = File::from_std(std);
-        Poll::Ready(Ok(file.into()))
+        Poll::Ready(Ok(file))
     }
 }

tokio-fs/src/file/seek.rs

@@ -35,6 +35,6 @@ impl Future for SeekFuture {
             .expect("Cannot poll `SeekFuture` after it resolves")
             .poll_seek(inner_self.pos))?;
         let inner = inner_self.inner.take().unwrap();
-        Poll::Ready(Ok((inner, pos).into()))
+        Poll::Ready(Ok((inner, pos)))
     }
 }