From ae2395f55fccdef5ecee781b3be095fc6a0dca01 Mon Sep 17 00:00:00 2001
From: Roman Khimov <roman@nspcc.ru>
Date: Tue, 17 May 2022 14:45:08 +0300
Subject: [PATCH] vm: simplify (slot).Set code

Refcounter handles nil items just fine.
---
 pkg/vm/slot.go | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/pkg/vm/slot.go b/pkg/vm/slot.go
index 4544ab8dd..661e796d8 100644
--- a/pkg/vm/slot.go
+++ b/pkg/vm/slot.go
@@ -23,13 +23,8 @@ func (s slot) Set(i int, item stackitem.Item, refs *refCounter) {
 	if s[i] == item {
 		return
 	}
-	old := s[i]
+	refs.Remove(s[i])
 	s[i] = item
-	if old != nil {
-		refs.Remove(old)
-	} else {
-		*refs-- // Not really existing, but counted Null element.
-	}
 	refs.Add(item)
 }