[openssl/openssl] 19b6b5: Fix older clang warning on initialization

[Tomáš Mráz]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: 19b6b5f4791e3531cd6d3aabc8706d590ade14b7
      https://github.com/openssl/openssl/commit/19b6b5f4791e3531cd6d3aabc8706d590ade14b7
  Author: Tomas Mraz <tomas at openssl.org>
  Date:   2022-10-07 (Fri, 07 Oct 2022)

  Changed paths:
    M test/bio_dgram_test.c

  Log Message:
  -----------
  Fix older clang warning on initialization

We use memset() instead.

Reviewed-by: Hugo Landau <hlandau at openssl.org>
Reviewed-by: Paul Dale <pauli at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19311)