mcb: Use the actual bus passed to init and release functions

The functions mcb_bus_add_devices() and mcb_devices_unregister()
take a mcb_bus as argument that is never being used. This implies
that there is only one bus.

Do not ignore mcb_bus parameter and get the actual bus_type from
the device related to this mcb_bus.
Co-developed-by: Jorge Sanjuan Garcia <jorge.sanjuangarcia@duagon.com>
Signed-off-by: Jorge Sanjuan Garcia <jorge.sanjuangarcia@duagon.com>
Signed-off-by: Jose Javier Rodriguez Barbarin <JoseJavier.Rodriguez@duagon.com>
Link: https://lore.kernel.org/r/20231020124324.54692-2-JoseJavier.Rodriguez@duagon.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/mcb/mcb-core.c

@@ -311,7 +311,7 @@ static int __mcb_devices_unregister(struct device *dev, void *data)
 
 static void mcb_devices_unregister(struct mcb_bus *bus)
 {
-	bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_devices_unregister);
+	bus_for_each_dev(bus->dev.bus, NULL, NULL, __mcb_devices_unregister);
 }
 /**
  * mcb_release_bus() - Free a @mcb_bus
@@ -406,7 +406,7 @@ static int __mcb_bus_add_devices(struct device *dev, void *data)
  */
 void mcb_bus_add_devices(const struct mcb_bus *bus)
 {
-	bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_bus_add_devices);
+	bus_for_each_dev(bus->dev.bus, NULL, NULL, __mcb_bus_add_devices);
 }
 EXPORT_SYMBOL_NS_GPL(mcb_bus_add_devices, MCB);