[PATCH 4/8] maple_tree: use macro MA_ROOT_PARENT instead of number

[Vernon Yang <vernon2gm@gmail.com>]

When you need to compare whether node->parent is parent of the
root node, using macro MA_ROOT_PARENT is easier to understand
and for better readability.

Signed-off-by: Vernon Yang <vernon2gm@gmail.com>
---
 lib/maple_tree.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 3d45c515ed42..b3a215dd961e 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -503,8 +503,7 @@ static inline unsigned int mte_parent_slot(const struct maple_enode *enode)
 {
 	unsigned long val = (unsigned long)mte_to_node(enode)->parent;
 
-	/* Root. */
-	if (val & 1)
+	if (val & MA_ROOT_PARENT)
 		return 0;
 
 	/*
-- 
2.34.1