dm: report which conflicting type caused error during table_load()

Eases troubleshooting to know the before vs after types.

Signed-off-by: Mike Snitzer <[e-mail]>

drivers/md/dm-ioctl.c

···
 			goto err_unlock_md_type;
 		}
 	} else if (!is_valid_type(dm_get_md_type(md), dm_table_get_type(t))) {
-		DMWARN("can't change device type after initial table load.");
+		DMWARN("can't change device type (old=%u vs new=%u) after initial table load.",
+		       dm_get_md_type(md), dm_table_get_type(t));
 		r = -EINVAL;
 		goto err_unlock_md_type;
 	}