BUGFIX: Zabbix server DBping error on oracle

[Shmuma]

Hello,

when we use oracle database, watchdog process always terminated at zabbix_server startup. This caused by 1 DB connection restriction used when we initialize libsqlora8: sqlo_init(SQLO_OFF, 1, 100) in zbx_db_connect.

In this code:

void main_watchdog_loop()
{
	/* Disable writing to database in zabbix_syslog() */
	CONFIG_ENABLE_LOG = 0;

	DBconnect(ZBX_DB_CONNECT_NORMAL);
	init_config();

	for(;;)
	{
		ping_database();
		sleep(60);
	}
	/* We will never reach this point */
	DBclose();
}

We always hold one connection opened before init_config call, and trying to open new connection in ping_database. So, it's better to close first connection because we don't need it after init_config:

void main_watchdog_loop()
{
	/* Disable writing to database in zabbix_syslog() */
	CONFIG_ENABLE_LOG = 0;

	DBconnect(ZBX_DB_CONNECT_NORMAL);
	init_config();
	DBclose();

	for(;;)
	{
		ping_database();
		sleep(60);
	}
	/* We will never reach this point */
}

Patch against 1.4.4 attached to this message.