https://git.ruby-lang.org/ruby.git/commit/?id=45786667ec

From 45786667ec0b0c2af5bf2c2069246edaae2d7c30 Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@p...>
Date: Mon, 14 Mar 2022 09:39:51 -0400
Subject: Assume that shared_root exists in rb_ary_decrement_share

All callers of rb_ary_decrement_share guarantee that
shared_root is not 0.
---
 array.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/array.c b/array.c
index ae2ba38cbe..53e69f2a32 100644
--- a/array.c
+++ b/array.c
@@ -512,11 +512,9 @@ ary_double_capa(VALUE ary, long min) https://github.com/ruby/ruby/blob/trunk/array.c#L512
 static void
 rb_ary_decrement_share(VALUE shared_root)
 {
-    if (shared_root) {
-        long num = ARY_SHARED_ROOT_REFCNT(shared_root) - 1;
-        if (num > 0) {
-            ARY_SET_SHARED_ROOT_REFCNT(shared_root, num);
-        }
+    long num = ARY_SHARED_ROOT_REFCNT(shared_root) - 1;
+    if (num > 0) {
+        ARY_SET_SHARED_ROOT_REFCNT(shared_root, num);
     }
 }
 
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