[WATCHDOG] Unlock in iTCO_wdt_start when reboot is disabled

Unlock in iTCO_wdt_start when reboot is disabled
Signed-off-by: Roel Kluin <12o3l@tiscali.nl>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

drivers/watchdog/iTCO_wdt.c

@@ -300,6 +300,7 @@ static int iTCO_wdt_start(void)
 
 	/* disable chipset's NO_REBOOT bit */
 	if (iTCO_wdt_unset_NO_REBOOT_bit()) {
+		spin_unlock(&iTCO_wdt_private.io_lock);
 		printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, reboot disabled by hardware\n");
 		return -EIO;
 	}