mfd: arizona: Use num_core_supplies in arizona_dev_exit

Currently we call regulator_bulk_disable with
ARRAY_SIZE(arizona->core_supplies), however this array may be larger
than the number of supplies actually used by the chip we are dealing
with. Use the provided num_core_supplies member instead, so that we only
disable supplies which actually exist.
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/arizona-core.c

@@ -1038,7 +1038,7 @@ int arizona_dev_exit(struct arizona *arizona)
 	if (arizona->pdata.reset)
 		gpio_set_value_cansleep(arizona->pdata.reset, 0);
 
-	regulator_bulk_disable(ARRAY_SIZE(arizona->core_supplies),
+	regulator_bulk_disable(arizona->num_core_supplies,
 			       arizona->core_supplies);
 	return 0;
 }