qemu: checkpoint: fix NULL dereference at create time
qemu: checkpoint: fix NULL dereference at create time

'cfg' is never initialized here, which causes a crash
later in qemuCheckpointCreateFinalize

Reviewed-by: Peter Krempa <2cf5c04c61aa466e4a47bfedc747d17279c72ffc@redhat.com>
Signed-off-by: Cole Robinson <7cd45ff6ad1fb7cf556a02797d774247851499f8@redhat.com>

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