Non-OpenSSL backends are not able to report a specific error code
for self-signed certificates.
Change-Id: I56bf130335b2afa65cf2bd5248a40ac0e32f74c2
Reviewed-by: Timur Pocheptsov <Timur.Pocheptsov@digia.com>
Reviewed-by: Richard J. Moore <rich@kde.org>