[openssl/openssl] 1258a8: Add negative integer check when using ASN1_BIT_STRING

[Martin Litre]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: 1258a8e4361320cd3cfaf9ede692492ce01034c8
      https://github.com/openssl/openssl/commit/1258a8e4361320cd3cfaf9ede692492ce01034c8
  Author: mlitre <martinlitre at mac.com>
  Date:   2023-05-04 (Thu, 04 May 2023)

  Changed paths:
    M crypto/asn1/a_bitstr.c

  Log Message:
  -----------
  Add negative integer check when using ASN1_BIT_STRING

The negative integer check is done to prevent potential overflow.
Fixes #20719.

CLA: trivial

Reviewed-by: Tomas Mraz <tomas at openssl.org>
Reviewed-by: Paul Dale <pauli at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/20862)