virsh: avoid heap corruption leading to virsh abort
virsh: avoid heap corruption leading to virsh abort

* tools/virsh.c (vshParseSnapshotDiskspec): Fix off-by-3 memmove
that would corrupt heap when parsing escaped --diskspec comma.
Bug introduced via commit v0.9.4-260-g35d52b5.

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