regulator: devres: fix devm_regulator_get_enable_read_voltage() return

The devm_regulator_get_enable_read_voltage() function is supposed to
return the voltage that the regulator is currently set to. However, it
currently returns 0.

Fixes: b250c20 ("regulator: devres: add API for reference voltage supplies")
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://lore.kernel.org/r/20240506-regulator-devm_regulator_get_enable_read_voltage-fixes-v1-1-356cdd152067@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: dlech

drivers/regulator/devres.c

@@ -193,7 +193,7 @@ int devm_regulator_get_enable_read_voltage(struct device *dev, const char *id)
 	if (ret < 0)
 		goto err_release_action;
 
-	return 0;
+	return ret;
 
 err_release_action:
 	devm_release_action(dev, regulator_action_disable, r);