Eric Blake ee70839bbf nwfilter: plug memory leak with firewall
Introduced in commit 70571ccc (v1.2.4). Caught by valgrind:

==9816== 170 (32 direct, 138 indirect) bytes in 1 blocks are definitely lost in loss record 646 of 821
==9816==    at 0x4A081D4: calloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==9816==    by 0x50836FB: virAlloc (viralloc.c:144)
==9816==    by 0x50AEC2B: virFirewallNew (virfirewall.c:204)
==9816==    by 0x1E2308ED: ebiptablesDriverProbeStateMatch (nwfilter_ebiptables_driver.c:3715)
==9816==    by 0x1E2309AD: ebiptablesDriverInit (nwfilter_ebiptables_driver.c:3742)

* src/nwfilter/nwfilter_ebiptables_driver.c
(ebiptablesDriverProbeStateMatch): Properly clean up.

Signed-off-by: Eric Blake <eblake@redhat.com>
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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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