Index: head/sys/compat/linuxkpi/common/include/linux/rbtree.h
===================================================================
--- head/sys/compat/linuxkpi/common/include/linux/rbtree.h
+++ head/sys/compat/linuxkpi/common/include/linux/rbtree.h
@@ -60,7 +60,7 @@
 
 #define RB_EMPTY_ROOT(root)     RB_EMPTY((struct linux_root *)root)
 #define RB_EMPTY_NODE(node)     (RB_PARENT(node, __entry) == node)
-#define RB_CLEAR_NODE(node)     (RB_SET_PARENT(node, node, __entry))
+#define RB_CLEAR_NODE(node)     RB_SET_PARENT(node, node, __entry)
 
 #define	rb_insert_color(node, root)					\
 	linux_root_RB_INSERT_COLOR((struct linux_root *)(root), (node))