fs: remove unused assignment

PR-URL: #35642
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>

lib/fs.js

@@ -884,7 +884,7 @@ function rmdirSync(path, options) {
     return rimrafSync(pathModule.toNamespacedPath(path), options);
   }
 
-  options = validateRmdirOptions(options);
+  validateRmdirOptions(options);
   const ctx = { path };
   binding.rmdir(pathModule.toNamespacedPath(path), undefined, ctx);
   return handleErrorFromBinding(ctx);