we don't need to check permissions twice

Author: schiessle

apps/files_versions/lib/Storage.php

@@ -320,16 +320,10 @@ public static function rollback($file, $revision) {
 			// add expected leading slash
 			$file = '/' . ltrim($file, '/');
 			list($uid, $filename) = self::getUidAndFilename($file);
-			if ($uid === null || trim($filename, '/') === '') {
-				return false;
-			}
+
 			$users_view = new View('/'.$uid);
 			$files_view = new View('/'. User::getUser().'/files');
 
-			if (!$files_view->isUpdatable($filename)) {
-				return false;
-			}
-
 			$versionCreated = false;
 
 			$fileInfo = $files_view->getFileInfo($file);