6b758f3 KRB5: cancel the sysdb transaction on one place only

Authored and Committed by jhrozek 8 years ago
    KRB5: cancel the sysdb transaction on one place only
    
    https://fedorahosted.org/sssd/ticket/1516
    
    If sysdb_set_user_attr failed, we would cancel the transaction, then go
    to the error handler and attempt to close it again.