Address reviewer comments

Signed-off-by: Nick Cameron <nrc@ncameron.org>

library/std/src/sys/unsupported/fs.rs

@@ -214,7 +214,7 @@ impl File {
         self.0
     }
 
-    pub fn read_buf(&self, _cursor: BorrowedCursor<'_, '_>) -> io::Result<()> {
+    pub fn read_buf(&self, _cursor: BorrowedCursor<'_>) -> io::Result<()> {
         self.0
     }