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>
struct regulator *regulator_get(struct device *dev, const char *id)
{
	return _regulator_get(dev, id, false, true);
}

struct regulator *regulator_get(struct device *dev, const char *id)
{
	return _regulator_get(dev, id, false, true);
}
