tests: Fix memory leak in virnetmessagetest
tests: Fix memory leak in virnetmessagetest

Detected when playing with "make -C tests valgrind".

agx/libvirt,warewolf/libvirt,crobinso/libvirt,warewolf/libvirt,VenkatDatta/libvirt,bjzhang/libvirt,leilihh/libvirt,jeckersb/libvirt,eskultety/libvirt,jeckersb/libvirt,trainstack/libvirt,danwent/libvirt-ovs,elmarco/libvirt,soulxu/libvirt-xuhj,kantai/libvirt-vfork,jfehlig/libvirt,zhlcindy/libvirt-1.1.4-maintain,siboulet/libvirt-openvz,wiedi/libvirt,foomango/libvirt,wiedi/libvirt,novel/fbsd-libvirt,agx/libvirt,taget/libvirt,emaste/libvirt,zhlcindy/libvirt-1.1.4-maintain,wiedi/libvirt,zhlcindy/libvirt-1.1.4-maintain,danwent/libvirt-ovs,nertpinx/libvirt,datto/libvirt,emaste/libvirt,elmarco/libvirt,novel/fbsd-libvirt,trainstack/libvirt,jardasgit/libvirt,novel/fbsd-libvirt,novel/fbsd-libvirt,elmarco/libvirt,jeckersb/libvirt,fabianfreyer/libvirt,wiedi/libvirt,rmarwaha/libvirt1,libvirt/libvirt,jeckersb/libvirt,zippy2/libvirt,nertpinx/libvirt,datto/libvirt,novel/fbsd-libvirt,dumbbell/libvirt,taget/libvirt,rmarwaha/libvirt,usc-isi/libvirt,rmarwaha/libvirt,iam-TJ/libvirt,eskultety/libvirt,usc-isi/libvirt,jfehlig/libvirt,leilihh/libvirt,dumbbell/libvirt,novel/fbsd-libvirt,siboulet/libvirt-openvz,soulxu/libvirt-xuhj,rlaager/libvirt,dumbbell/libvirt,shugaoye/libvirt,shugaoye/libvirt,iam-TJ/libvirt,nertpinx/libvirt,kantai/libvirt-vfork,bjzhang/libvirt,trainstack/libvirt,crobinso/libvirt,rmarwaha/libvirt1,wiedi/libvirt,usc-isi/libvirt,bjzhang/libvirt,rmarwaha/libvirt1,siboulet/libvirt-openvz,usc-isi/libvirt,VenkatDatta/libvirt,emaste/libvirt,VenkatDatta/libvirt,olafhering/libvirt,soulxu/libvirt-xuhj,taget/libvirt,emaste/libvirt,datto/libvirt,leilihh/libvirt,trainstack/libvirt,leilihh/libvirt,VenkatDatta/libvirt,emaste/libvirt,olafhering/libvirt,danwent/libvirt-ovs,danwent/libvirt-ovs,jeckersb/libvirt,cbosdo/libvirt,foomango/libvirt,rlaager/libvirt,zhlcindy/libvirt-1.1.4-maintain,zhlcindy/libvirt-1.1.4-maintain,foomango/libvirt,rmarwaha/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,shugaoye/libvirt,zippy2/libvirt,zippy2/libvirt,danwent/libvirt-ovs,usc-isi/libvirt,kantai/libvirt-vfork,libvirt/libvirt,foomango/libvirt,dumbbell/libvirt,iam-TJ/libvirt,taget/libvirt,eskultety/libvirt,foomango/libvirt,trainstack/libvirt,iam-TJ/libvirt,soulxu/libvirt-xuhj,agx/libvirt,crobinso/libvirt,wiedi/libvirt,cbosdo/libvirt,rmarwaha/libvirt1,rmarwaha/libvirt,rmarwaha/libvirt,eskultety/libvirt,siboulet/libvirt-openvz,libvirt/libvirt,jeckersb/libvirt,novel/fbsd-libvirt,leilihh/libvirt,datto/libvirt,zippy2/libvirt,rmarwaha/libvirt1,iam-TJ/libvirt,taget/libvirt,rlaager/libvirt,rmarwaha/libvirt1,fabianfreyer/libvirt,andreabolognani/libvirt,olafhering/libvirt,datto/libvirt,trainstack/libvirt,dumbbell/libvirt,siboulet/libvirt-openvz,rmarwaha/libvirt,dumbbell/libvirt,shugaoye/libvirt,jardasgit/libvirt,agx/libvirt,leilihh/libvirt,warewolf/libvirt,jeckersb/libvirt,crobinso/libvirt,wiedi/libvirt,trainstack/libvirt,cbosdo/libvirt,andreabolognani/libvirt,iam-TJ/libvirt,kantai/libvirt-vfork,novel/fbsd-libvirt,rlaager/libvirt,shugaoye/libvirt,warewolf/libvirt,andreabolognani/libvirt,nertpinx/libvirt,iam-TJ/libvirt,jardasgit/libvirt,olafhering/libvirt,fabianfreyer/libvirt,soulxu/libvirt-xuhj,andreabolognani/libvirt,bjzhang/libvirt,elmarco/libvirt,jardasgit/libvirt,warewolf/libvirt,agx/libvirt,bjzhang/libvirt,VenkatDatta/libvirt,emaste/libvirt,fabianfreyer/libvirt,novel/fbsd-libvirt,jardasgit/libvirt,cbosdo/libvirt,jfehlig/libvirt,eskultety/libvirt,elmarco/libvirt,emaste/libvirt,cbosdo/libvirt,rlaager/libvirt,kantai/libvirt-vfork,nertpinx/libvirt,libvirt/libvirt,jfehlig/libvirt,warewolf/libvirt,warewolf/libvirt