da9052-battery: Don't free IRQ that wasn't requested

We should decrement "i" before doing the free_irq().  If we call this
because request_threaded_irq() failed then we don't want to free the
thing which failed.  Or in the case where we get here because
power_supply_register() failed then the original codes does a read past
the end of the array.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>

drivers/power/da9052-battery.c

@@ -623,7 +623,7 @@ static s32 __devinit da9052_bat_probe(struct platform_device *pdev)
 	return 0;
 
 err:
-	for (; i >= 0; i--) {
+	while (--i >= 0) {
 		irq = platform_get_irq_byname(pdev, da9052_bat_irqs[i]);
 		free_irq(bat->da9052->irq_base + irq, bat);
 	}