[openssl/openssl] b11183: Fix Coverity 1503314 unchecked return value

[pauli]

  Branch: refs/heads/master
  Home:   https://github.openssl.org/openssl/openssl
  Commit: b11183be0cd3ad675248804922bb240fbbd448e4
      https://github.openssl.org/openssl/openssl/commit/b11183be0cd3ad675248804922bb240fbbd448e4
  Author: Pauli <pauli at openssl.org>
  Date:   2022-05-04 (Wed, 04 May 2022)

  Changed paths:
    M apps/speed.c

  Log Message:
  -----------
  Fix Coverity 1503314 unchecked return value

Reviewed-by: David von Oheimb <david.von.oheimb at siemens.com>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18013)