[PATCH] fix module unload of sg

	It looks like sg.c was missed in the update from put_device to
	device_unregister.

drivers/scsi/sg.c

@@ -1607,7 +1607,7 @@ sg_detach(Scsi_Device * scsidp)
 		sdp->de = NULL;
 		device_remove_file(&sdp->sg_driverfs_dev, &dev_attr_type);
 		device_remove_file(&sdp->sg_driverfs_dev, &dev_attr_kdev);
-		put_device(&sdp->sg_driverfs_dev);
+		device_unregister(&sdp->sg_driverfs_dev);
 		if (NULL == sdp->headfp)
 			vfree((char *) sdp);
 	}