regulator: tps65219: Fix is_enabled checking in tps65219_set_bypass

Testing .enable cannot tell if a regulator is enabled or not, check return
value of .is_enabled() instead.
Also remove unneeded ret variable.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Link: https://lore.kernel.org/r/20220919122353.384171-1-axel.lin@ingics.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/tps65219-regulator.c

@@ -181,16 +181,14 @@ static int tps65219_set_bypass(struct regulator_dev *dev, bool enable)
 {
 	struct tps65219 *tps = rdev_get_drvdata(dev);
 	unsigned int rid = rdev_get_id(dev);
-	int ret = 0;
 
-	if (dev->desc->ops->enable) {
+	if (dev->desc->ops->is_enabled(dev)) {
 		dev_err(tps->dev,
 			"%s LDO%d enabled, must be shut down to set bypass ",
 			__func__, rid);
 		return -EBUSY;
 	}
-	ret =  regulator_set_bypass_regmap(dev, enable);
-	return ret;
+	return regulator_set_bypass_regmap(dev, enable);
 }
 
 /* Operations permitted on BUCK1/2/3 */