fix clippy::unit_arg: make it explicit that Ok(()) is being returned

Author: matthiaskrgr

src/librustdoc/docfs.rs

@@ -74,9 +74,9 @@ impl DocFS {
                     })
                 });
             });
-            Ok(())
         } else {
-            Ok(try_err!(fs::write(&path, contents), path))
+            try_err!(fs::write(&path, contents), path);
         }
+        Ok(())
     }
 }