Fix getstorage call

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

Author: rullzer

apps/files/lib/Controller/AjaxController.php

@@ -41,6 +41,7 @@ public function __construct(string $appName, IRequest $request) {
 	 * @NoAdminRequired
 	 */
 	public function getStorageStats(string $dir = '/'): JSONResponse {
+		\OC_Util::setupFS();
 		try {
 			return new JSONResponse([
 				'status' => 'success',