driver core fixes: device_register() retval check in platform.c

Check the return value of device_register() in platform_bus_init().

Signed-off-by: Cornelia Huck <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/base/platform.c

···
 
 int __init platform_bus_init(void)
 {
-	device_register(&platform_bus);
-	return bus_register(&platform_bus_type);
+	int error;
+
+	error = device_register(&platform_bus);
+	if (error)
+		return error;
+	error =  bus_register(&platform_bus_type);
+	if (error)
+		device_unregister(&platform_bus);
+	return error;
 }
 
 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK