qemu: fix a bug in numatune
qemu: fix a bug in numatune

When setting numa nodeset for a domain which has no nodeset set
before, libvirtd crashes by dereferencing the pointer to the old
nodemask which is null in that case.

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