[openssl/openssl] f44d32: add a check for the return of sk_SRP_gN_new_null()...

[Jerry]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: f44d32fdfbd2a249dae74dc24478f31fca69d288
      https://github.com/openssl/openssl/commit/f44d32fdfbd2a249dae74dc24478f31fca69d288
  Author: xkernel <xkernel.wang at foxmail.com>
  Date:   2022-10-20 (Thu, 20 Oct 2022)

  Changed paths:
    M crypto/srp/srp_vfy.c

  Log Message:
  -----------
  add a check for the return of sk_SRP_gN_new_null() so that capture the potential memory error in time

Reviewed-by: Tomas Mraz <tomas at openssl.org>
Reviewed-by: Paul Dale <pauli at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19435)