Fix size_hint calculation

Author: Daksh14

tokio/src/fs/read_uring.rs

@@ -19,11 +19,7 @@ pub(crate) async fn read_uring(path: &Path) -> io::Result<Vec<u8>> {
     let file = OpenOptions::new().read(true).open(path).await?;
 
     // TODO: use io uring in the future to obtain metadata
-    let size_hint: Option<usize> = file
-        .metadata()
-        .await
-        .map(|m| usize::try_from(m.len()).unwrap_or(usize::MAX))
-        .ok();
+    let size_hint: Option<usize> = file.metadata().await.map(|m| m.len() as usize).ok();
 
     let fd: OwnedFd = file
         .try_into_std()