cpu_ppc64: Error out when model tag missing in virsh cpu-compare xml
cpu_ppc64: Error out when model tag missing in virsh cpu-compare xml

libvirtd throws unhandled signal 11 on ppc while running
virsh cpu-compare with missing model tag in the xml. This
patch errors out in such situation.

Signed-off-by: Nitesh Konkar <0c76797a2b22fdb43818c29f9111edd281fa1e01@linux.vnet.ibm.com>
Signed-off-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>

libvirt/libvirt,andreabolognani/libvirt,crobinso/libvirt,jardasgit/libvirt,crobinso/libvirt,nertpinx/libvirt,zippy2/libvirt,olafhering/libvirt,jardasgit/libvirt,crobinso/libvirt,jardasgit/libvirt,libvirt/libvirt,jfehlig/libvirt,jardasgit/libvirt,eskultety/libvirt,eskultety/libvirt,olafhering/libvirt,jfehlig/libvirt,andreabolognani/libvirt,nertpinx/libvirt,zippy2/libvirt,fabianfreyer/libvirt,olafhering/libvirt,zippy2/libvirt,nertpinx/libvirt,zippy2/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,eskultety/libvirt,eskultety/libvirt,libvirt/libvirt,nertpinx/libvirt,libvirt/libvirt,jfehlig/libvirt,nertpinx/libvirt,crobinso/libvirt,fabianfreyer/libvirt,olafhering/libvirt,jardasgit/libvirt,jfehlig/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,eskultety/libvirt,fabianfreyer/libvirt