netdev_vlan_conf: Resolve memory leak found by Valgrind.
netdev_vlan_conf: Resolve memory leak found by Valgrind.

The 'trunk' is filled in with virXPathString() value, but was
never VIR_FREE()'d.

VenkatDatta/libvirt,trainstack/libvirt,fabianfreyer/libvirt,taget/libvirt,trainstack/libvirt,shugaoye/libvirt,cbosdo/libvirt,crobinso/libvirt,elmarco/libvirt,libvirt/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,jfehlig/libvirt,olafhering/libvirt,iam-TJ/libvirt,libvirt/libvirt,elmarco/libvirt,siboulet/libvirt-openvz,iam-TJ/libvirt,zhlcindy/libvirt-1.1.4-maintain,elmarco/libvirt,andreabolognani/libvirt,zhlcindy/libvirt-1.1.4-maintain,eskultety/libvirt,datto/libvirt,shugaoye/libvirt,zippy2/libvirt,rlaager/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,zhlcindy/libvirt-1.1.4-maintain,iam-TJ/libvirt,datto/libvirt,andreabolognani/libvirt,eskultety/libvirt,rlaager/libvirt,VenkatDatta/libvirt,zippy2/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,taget/libvirt,jfehlig/libvirt,jardasgit/libvirt,iam-TJ/libvirt,olafhering/libvirt,zippy2/libvirt,shugaoye/libvirt,olafhering/libvirt,siboulet/libvirt-openvz,siboulet/libvirt-openvz,cbosdo/libvirt,eskultety/libvirt,agx/libvirt,cbosdo/libvirt,zhlcindy/libvirt-1.1.4-maintain,libvirt/libvirt,eskultety/libvirt,datto/libvirt,taget/libvirt,agx/libvirt,datto/libvirt,jardasgit/libvirt,VenkatDatta/libvirt,rlaager/libvirt,cbosdo/libvirt,agx/libvirt,iam-TJ/libvirt,crobinso/libvirt,jardasgit/libvirt,siboulet/libvirt-openvz,nertpinx/libvirt,olafhering/libvirt,shugaoye/libvirt,jfehlig/libvirt,trainstack/libvirt,jfehlig/libvirt,andreabolognani/libvirt,elmarco/libvirt,jardasgit/libvirt,trainstack/libvirt,crobinso/libvirt,zippy2/libvirt,crobinso/libvirt,libvirt/libvirt,iam-TJ/libvirt,shugaoye/libvirt,fabianfreyer/libvirt,datto/libvirt,jardasgit/libvirt,siboulet/libvirt-openvz,taget/libvirt,agx/libvirt,cbosdo/libvirt,eskultety/libvirt,zhlcindy/libvirt-1.1.4-maintain,nertpinx/libvirt,fabianfreyer/libvirt,trainstack/libvirt,iam-TJ/libvirt,nertpinx/libvirt,rlaager/libvirt,agx/libvirt,andreabolognani/libvirt,rlaager/libvirt,trainstack/libvirt,trainstack/libvirt,elmarco/libvirt,VenkatDatta/libvirt,taget/libvirt