[openssl/openssl] 11f7b6: Fix arithmetic expression overflow

[JohnnySavages]

  Branch: refs/heads/openssl-3.0
  Home:   https://github.com/openssl/openssl
  Commit: 11f7b60b6ff4d2186f83fbe05f3ffbdebaa8572b
      https://github.com/openssl/openssl/commit/11f7b60b6ff4d2186f83fbe05f3ffbdebaa8572b
  Author: Drokov Pavel <drokov at rutoken.ru>
  Date:   2024-01-15 (Mon, 15 Jan 2024)

  Changed paths:
    M crypto/objects/obj_dat.c

  Log Message:
  -----------
  Fix arithmetic expression overflow

If the value of a->length is large (>= 2^12), then an integer overflow will
occur for the signed type, which according to the C standard is UB.

CLA: trivial

Reviewed-by: Matt Caswell <matt at openssl.org>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/23274)

(cherry picked from commit 486ab0fb003d05f89620662260486d31bd3faa8c)