siox: Provide a devm variant of siox_master_register()

This allows to simplify siox master drivers in the next step.
Acked-by: Thorsten Scherer <t.scherer@eckelmann.de>
Link: https://lore.kernel.org/r/e961dfb3e94f106b16f5eacff2110fc7fa0cab13.1708328466.git.u.kleine-koenig@pengutronix.deSigned-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

drivers/siox/siox-core.c

@@ -795,6 +795,25 @@ void siox_master_unregister(struct siox_master *smaster)
 }
 EXPORT_SYMBOL_GPL(siox_master_unregister);
 
+static void devm_siox_master_unregister(void *data)
+{
+	struct siox_master *smaster = data;
+
+	siox_master_unregister(smaster);
+}
+
+int devm_siox_master_register(struct device *dev, struct siox_master *smaster)
+{
+	int ret;
+
+	ret = siox_master_register(smaster);
+	if (ret)
+		return ret;
+
+	return devm_add_action_or_reset(dev, devm_siox_master_unregister, smaster);
+}
+EXPORT_SYMBOL_GPL(devm_siox_master_register);
+
 static struct siox_device *siox_device_add(struct siox_master *smaster,
 					   const char *type, size_t inbytes,
 					   size_t outbytes, u8 statustype)

drivers/siox/siox.h

@@ -49,3 +49,5 @@ struct siox_master *devm_siox_master_alloc(struct device *dev, size_t size);
 
 int siox_master_register(struct siox_master *smaster);
 void siox_master_unregister(struct siox_master *smaster);
+
+int devm_siox_master_register(struct device *dev, struct siox_master *smaster);