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Description of problem:

virsh snapshot-edit <nonexistent domain> <snapshot>
virsh snapshot-edit <domain> <nonexistent snapshot>

both output an error message (besides other):
error: Failed to update HE

Version-Release number of selected component (if applicable):
libvirt-0.10.2-8.el6

How reproducible:
100 %

Steps to Reproduce:
virsh snapshot-edit asdnkl akldsakm
  
Actual results:
error: failed to get domain 'asdnkl'
error: Failed to update HE
error: Domain not found: no domain with matching name 'asdnkl'

Expected results:
without "error: Failed to update HE"

Additional info:
Already fixed upstream by:
commit 689b64d666bc268d55395a92a2b9d6cd51b3ad70
Author:     Ján Tomko <jtomko>
AuthorDate: Thu Nov 15 11:37:32 2012
Commit:     Michal Privoznik <mprivozn>
CommitDate: Thu Nov 15 11:45:40 2012

    virsh: fix uninitialized variable in cmdSnapshotEdit

Moving to POST:
http://post-office.corp.redhat.com/archives/rhvirt-patches/2012-November/msg00168.html

# virsh snapshot-edit asdf sadf
error: failed to get domain 'asdf'
error: Domain not found: no domain with matching name 'asdf'


# virsh snapshot-edit aaa sdf
error: Domain snapshot not found: no domain snapshot with matching name 'sdf'

So it's verified.

pkg: libvirt-0.10.2-9.el6.x86_64

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.

http://rhn.redhat.com/errata/RHSA-2013-0276.html