regulator: core: Simplify error flow in _regulator_do_set_voltage()

If the voltage can not be set jump to the end of the function. This
avoids having to check for an error multiple times and eliminates one
level of nesting in a follow-up change.
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/core.c

@@ -2800,8 +2800,11 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
 		ret = -EINVAL;
 	}
 
+	if (ret)
+		goto out;
+
 	/* Call set_voltage_time_sel if successfully obtained old_selector */
-	if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0
+	if (!rdev->constraints->ramp_disable && old_selector >= 0
 		&& old_selector != selector) {
 
 		delay = ops->set_voltage_time_sel(rdev,
@@ -2821,13 +2824,14 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
 		}
 	}
 
-	if (ret == 0 && best_val >= 0) {
+	if (best_val >= 0) {
 		unsigned long data = best_val;
 
 		_notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
 				     (void *)data);
 	}
 
+out:
 	trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
 
 	return ret;