Merge pull request #3648 from owncloud/sql_limit_as_param

convert LIMIT to parameter

lib/files/cache/legacy.php

@@ -45,7 +45,7 @@ class Legacy {
 			return $this->cacheHasItems;
 		}
 		try {
-			$query = \OC_DB::prepare('SELECT `id` FROM `*PREFIX*fscache` WHERE `user` = ? LIMIT 1');
+			$query = \OC_DB::prepare('SELECT `id` FROM `*PREFIX*fscache` WHERE `user` = ?',1);
 		} catch (\Exception $e) {
 			$this->cacheHasItems = false;
 			return false;