refactor: use the built-in max/min to simplify the code

Signed-off-by: pkucode <[email protected]>

Author: pkucode

memiavl/mem_node.go

@@ -88,7 +88,7 @@ func (node *MemNode) Hash() []byte {
 }
 
 func (node *MemNode) updateHeightSize() {
-	node.height = maxUInt8(node.left.Height(), node.right.Height()) + 1
+	node.height = max(node.left.Height(), node.right.Height()) + 1
 	node.size = node.left.Size() + node.right.Size()
 }
 
@@ -210,9 +210,3 @@ func EncodeBytes(w io.Writer, bz []byte) error {
 	return err
 }
 
-func maxUInt8(a, b uint8) uint8 {
-	if a > b {
-		return a
-	}
-	return b
-}