Add in missing free result on DB query

git-svn-id: file:///svn/phpbb/branches/phpBB-3_0_0@9179 89ea8834-ac86-4346-8a33-228a782c2dd0

phpBB/includes/acp/acp_modules.php

@@ -658,6 +658,8 @@ class acp_modules
 
 			$iteration++;
 		}
+		$db->sql_freeresult($result);
+
 		unset($padding_store);
 
 		return $module_list;