regulator: core: Fix regualtor_ena_gpio_free not to access pin after freeing

After freeing pin from regulator_ena_gpio_free, loop can access
the pin. So this patch fixes not to access pin after freeing.

Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
{
	struct regulator_bulk_data *bulk = data;

	bulk->ret = regulator_enable(bulk->consumer);
}

static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
{
	struct regulator_bulk_data *bulk = data;

	bulk->ret = regulator_enable(bulk->consumer);
}
