virNWFilterDefParseXML: avoid leak on error paths
virNWFilterDefParseXML: avoid leak on error paths

* src/conf/nwfilter_conf.c (virNWFilterDefParseXML): Also free "ret"
via cleanup.

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