c1fbc6b krb5 locator: make plugin more robust

1 file Authored by sbose 5 years ago, Committed by fidencio 5 years ago,
    krb5 locator: make plugin more robust
    
    Although currently libkrb5 sets all parameters of the locator plugin
    calls to suitable values we should make sure that provided pointers are
    not NULL before trying to dereference them.
    
    Related to https://pagure.io/SSSD/sssd/issue/941
    Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>