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Description of problem:
When try to get parent of nodedev if there is no parent,libvirt-tck get error.


Version-Release number of selected component (if applicable):
libvirt-0.10.2-17.el6.x86_64
perl-Sys-Virt-0.10.2-5.el6.x86_64
kernel-2.6.32-348.el6.x86_64
qemu-kvm-rhev-0.12.1.2-2.348.el6.x86_64


How reproducible:
100%

Steps to Reproduce:
1.in libvirt-tck script,added
.....
my @nodelist = $conn->list_all_node_devices();
  foreach my $dev (@nodelist){
  my $parent = $dev->get_parent();
  diag $parent;
}
.....

Actual results:

libvirt error code: 0, message: Unknown problem



Expected results:
should return "undef"

Additional info:
the first item in nodelist is "computer",no parent.
use python interface can return "None".

commit 04470fa5412cbd04386c5c2e785e4672cc6e0e0f
Author: Daniel P. Berrange <berrange>
Date:   Tue Aug 6 14:23:55 2013 +0100

    Fix error handling for virNodeDeviceGetParent()
    
    It is valid for virNodeDeviceGetParent() to return NULL in the
    case where there is no parent device present.
    
    Signed-off-by: Daniel P. Berrange <berrange>

verify with build:perl-Sys-Virt-0.10.2-6.el6.x86_64

step:

same step with bug description
no libvirt error return.

move to verified.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-1387.html