[openssl/openssl] df04b0: Add missing assignment to EVP_get_digestbynid()

[Niels Dossche]

  Branch: refs/heads/openssl-3.0
  Home:   https://github.com/openssl/openssl
  Commit: df04b07e079edcc873e3d353541e1aae92fa7786
      https://github.com/openssl/openssl/commit/df04b07e079edcc873e3d353541e1aae92fa7786
  Author: ndossche <niels.dossche at ugent.be>
  Date:   2023-03-15 (Wed, 15 Mar 2023)

  Changed paths:
    M crypto/evp/evp_pbe.c

  Log Message:
  -----------
  Add missing assignment to EVP_get_digestbynid()

The assignment of the result of EVP_get_digestbynid() did not happen
which made the fallback not actually perform the fallback.

CLA: trivial

Reviewed-by: Tomas Mraz <tomas at openssl.org>
Reviewed-by: Matt Caswell <matt at openssl.org>
Reviewed-by: Paul Dale <pauli at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/20447)

(cherry picked from commit c09c202e9bc66f0300ee598ca94f2b3fa5a5899d)