Peter Krempa 5f91518937 qemu: perf: Fix crash/memory corruption on failed VM start
The new perf code didn't bother to clear a pointer in 'priv' causing a
double free or other memory corruption goodness if a VM failed to start.

Clear the pointer after freeing the memory.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1324757
(cherry picked from commit 03e8d5fb54c7c897225ed9ea56d83b894930f144)
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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 provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
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