[openssl/openssl] 624efd: ssl3_mac(): Fix possible divide by zero bug

[xiaoxiaoafeifei]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: 624efd2ba6f1dabdcdecf17c77bd206c421efdaf
      https://github.com/openssl/openssl/commit/624efd2ba6f1dabdcdecf17c77bd206c421efdaf
  Author: zhailiangliang <zhailiangliang at loongson.cn>
  Date:   2022-12-22 (Thu, 22 Dec 2022)

  Changed paths:
    M ssl/record/methods/ssl3_meth.c

  Log Message:
  -----------
  ssl3_mac(): Fix possible divide by zero bug

CLA: trivial

Reviewed-by: Hugo Landau <hlandau at openssl.org>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19912)