[libvirt] LXC veth.c issue

[Atsushi SAKAI]

Hello, Dan Smith

Please check your moveInterfaceToNetNs on veth.c
**rc** and **len** have warning problem.
http://builder.virt-manager.org/logs/modules/libvirt--devel-build-output.log

P.S.
Many Dan stay in this mailing list.
Also My previous patch save this problem for general users 
but not for LXC users :-)

Thanks
Atsushi SAKAI