Fix bugs caught by static analysis

Aleksander Machniak

2013-05-06 78c270c9f259c33b703cfb26b96b8dbb062db21e

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-- Upgrade from 0.9-beta
 
CREATE TABLE IF NOT EXISTS `system` (
 `name` varchar(64) NOT NULL,
 `value` mediumtext,
 PRIMARY KEY(`name`)
) /*!40000 ENGINE=INNODB */ /*!40101 CHARACTER SET utf8 COLLATE utf8_general_ci */;