[openssl/openssl] f80cde: fix Coverity 1506709: error handling

[pauli]

  Branch: refs/heads/master
  Home:   https://github.openssl.org/openssl/openssl
  Commit: f80cdee7c1eee93d13c7dcbeda32dfca3e1e4059
      https://github.openssl.org/openssl/openssl/commit/f80cdee7c1eee93d13c7dcbeda32dfca3e1e4059
  Author: Pauli <pauli at openssl.org>
  Date:   2022-07-01 (Fri, 01 Jul 2022)

  Changed paths:
    M test/fake_rsaprov.c

  Log Message:
  -----------
  fix Coverity 1506709: error handling

Reviewed-by: Shane Lontis <shane.lontis at oracle.com>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18679)