isci: remove rnc->device back pointer

Now that they are one in the same object remove the back pointer reference
in favor of container_of.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/scsi/isci/core/scic_sds_remote_device.c

@@ -1672,11 +1672,8 @@ void scic_remote_device_construct(struct scic_sds_port *sci_port,
 		&sci_dev->state_machine
 		);
 
-	scic_sds_remote_node_context_construct(
-		sci_dev,
-		&sci_dev->rnc,
-		SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX
-		);
+	scic_sds_remote_node_context_construct(&sci_dev->rnc,
+					       SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX);
 
 	sci_object_set_association(&sci_dev->rnc, sci_dev);
 }

drivers/scsi/isci/core/scic_sds_remote_device.h

@@ -339,6 +339,15 @@ struct scic_sds_remote_device {
 	const struct scic_sds_remote_device_state_handler *state_handlers;
 };
 
+static inline struct scic_sds_remote_device *rnc_to_dev(struct scic_sds_remote_node_context *rnc)
+{
+	struct scic_sds_remote_device *sci_dev;
+
+	sci_dev = container_of(rnc, typeof(*sci_dev), rnc);
+
+	return sci_dev;
+}
+
 typedef enum sci_status (*scic_sds_remote_device_request_handler_t)(
 	struct scic_sds_remote_device *device,
 	struct scic_sds_request *request);

drivers/scsi/isci/core/scic_sds_remote_node_context.h

@@ -231,15 +231,6 @@ struct scic_sds_remote_node_context {
 	 */
 	struct sci_base_object parent;
 
-	/**
-	 * This pointer simply points to the remote device object containing
-	 * this RNC.
-	 *
-	 * @todo Consider making the device pointer the associated object of the
-	 *       the parent object.
-	 */
-	struct scic_sds_remote_device *device;
-
 	/**
 	 * This field indicates the remote node index (RNI) associated with
 	 * this RNC.
@@ -279,10 +270,8 @@ struct scic_sds_remote_node_context {
 	struct scic_sds_remote_node_context_handlers *state_handlers;
 };
 
-void scic_sds_remote_node_context_construct(
-	struct scic_sds_remote_device *device,
-	struct scic_sds_remote_node_context *rnc,
-	u16 remote_node_index);
+void scic_sds_remote_node_context_construct(struct scic_sds_remote_node_context *rnc,
+					    u16 remote_node_index);
 
 
 bool scic_sds_remote_node_context_is_ready(