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Peter Krempa 9982758cc5 conf: Fix memory leak in graphics XML parser
When loading status XMLs with following graphics definition:

  <graphics type='spice' port='5900' autoport='yes' listen='127.0.0.1'>
    <listen type='address' address='127.0.0.1' fromConfig='1'/>
    <image compression='off'/>
  </graphics>

libvirtd would leak a few bytes:

10 bytes in 1 blocks are definitely lost in loss record 71 of 1,127
   at 0x4C2C000: malloc (vg_replace_malloc.c:299)
   by 0x6789298: xmlStrndup (in /usr/lib64/libxml2.so.2.9.4)
   by 0x552AB0A: virXMLPropString (virxml.c:479)
   by 0x5539536: virDomainGraphicsListensParseXML (domain_conf.c:11171)
   by 0x553DD5E: virDomainGraphicsDefParseXMLSpice (domain_conf.c:11414)
   by 0x553DD5E: virDomainGraphicsDefParseXML (domain_conf.c:11749)
   by 0x5566061: virDomainDefParseXML (domain_conf.c:16939)
   by 0x556953F: virDomainObjParseXML (domain_conf.c:17348)
   by 0x556953F: virDomainObjParseNode (domain_conf.c:17513)
   by 0x5569902: virDomainObjParseFile (domain_conf.c:17532)
   by 0x5571E02: virDomainObjListLoadStatus (virdomainobjlist.c:514)
   by 0x5571E02: virDomainObjListLoadAllConfigs (virdomainobjlist.c:596)
   by 0x26E0BDC8: qemuStateInitialize (qemu_driver.c:911)
   by 0x55B1FDB: virStateInitialize (libvirt.c:770)
   by 0x122039: daemonRunStateInit (libvirtd.c:960)
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         LibVirt : simple API for virtualization

  Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.

Daniel Veillard <veillard@redhat.com>
Description
Libvirt native C API and daemons
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