fix raw fd drop.

actix-files/src/named.rs

@@ -197,7 +197,9 @@ impl NamedFile {
                 // SAFETY: fd is borrowed and lives longer than the unsafe block.
                 unsafe {
                     let fs = std::fs::File::from_raw_fd(fd);
-                    fs.metadata()?
+                    let md = fs.metadata()?;
+                    std::mem::forget(fs);
+                    md
                 }
             }
         };