power_supply: 88pm860x: Fix leaked power supply on probe fail

Driver forgot to unregister power supply if request_threaded_irq()
failed in probe(). In such case the memory associated with power supply
leaked.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Fixes: a830d28b48bf ("power_supply: Enable battery-charger for 88pm860x")
Cc: <[e-mail]>
Signed-off-by: Sebastian Reichel <[e-mail]>

drivers/power/88pm860x_charger.c

···
 	return 0;
 
 out_irq:
+	power_supply_unregister(&info->usb);
 	while (--i >= 0)
 		free_irq(info->irq[i], info);
 out: