https://git.ruby-lang.org/ruby.git/commit/?id=3bca1b6aad

From 3bca1b6aadff1faf1c2308cd4eb7dd58948a47d8 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Wed, 13 May 2020 13:45:31 +0900
Subject: ext/openssl/ossl.h: Remove a variable that is used only in assert

It produces "unused variable" warnings in NDEBUG mode

diff --git a/ext/openssl/ossl.h b/ext/openssl/ossl.h
index 8074afc..c20f506 100644
--- a/ext/openssl/ossl.h
+++ b/ext/openssl/ossl.h
@@ -88,9 +88,8 @@ VALUE ossl_buf2str(char *buf, int len); https://github.com/ruby/ruby/blob/trunk/ext/openssl/ossl.h#L88
 VALUE ossl_str_new(const char *, long, int *);
 #define ossl_str_adjust(str, p) \
 do{\
-    long len = RSTRING_LEN(str);\
     long newlen = (long)((p) - (unsigned char*)RSTRING_PTR(str));\
-    assert(newlen <= len);\
+    assert(newlen <= RSTRING_LEN(str));\
     rb_str_set_len((str), newlen);\
 }while(0)
 /*
-- 
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