LDAP/AD: Do not fail in case rfc2307bis_nested_groups_recv() returns ENOENT
Commit 25699846 introduced a regression seen when an initgroup lookup is
done and there's no nested groups involved.
In this scenario the whole lookup fails due to an ENOENT returned by
rfc2307bis_nested_groups_recv(), which leads to the user removal from
sysdb causing some authentication issues.
Resolves:
https://pagure.io/SSSD/sssd/issue/3331
Signed-off-by: Fabiano FidĂȘncio <fidencio@redhat.com>
Reviewed-by: Sumit Bose <sbose@redhat.com>
(cherry picked from commit df4b24bed15f45bf286fb0102fd397218fdd4186)