scsi: drivers: base: Propagate errors through the transport component

The transport registration may fail. Make sure the errors are propagated
to the callers.

Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Greg Kroah-Hartman <[e-mail]>
Signed-off-by: Gabriel Krisman Bertazi <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/base/transport_class.c

···
 #include <linux/attribute_container.h>
 #include <linux/transport_class.h>
 
+static int transport_remove_classdev(struct attribute_container *cont,
+				     struct device *dev,
+				     struct device *classdev);
+
 /**
  * transport_class_register - register an initial transport class
  *
···
  * routine is simply a trigger point used to add the device to the
  * system and register attributes for it.
  */
-
-void transport_add_device(struct device *dev)
+int transport_add_device(struct device *dev)
 {
-	attribute_container_device_trigger(dev, transport_add_class_device);
+	return attribute_container_device_trigger_safe(dev,
+					transport_add_class_device,
+					transport_remove_classdev);
 }
 EXPORT_SYMBOL_GPL(transport_add_device);
 

include/linux/transport_class.h

···
 	container_of(x, struct transport_container, ac)
 
 void transport_remove_device(struct device *);
-void transport_add_device(struct device *);
+int transport_add_device(struct device *);
 void transport_setup_device(struct device *);
 void transport_configure_device(struct device *);
 void transport_destroy_device(struct device *);
 
-static inline void
+static inline int
 transport_register_device(struct device *dev)
 {
 	transport_setup_device(dev);
-	transport_add_device(dev);
+	return transport_add_device(dev);
 }
 
 static inline void