hw/ppc: Aborted (core dumped)

Reproducable:
$ ./ppc64-softmmu/qemu-system-ppc64 -S -machine ppce500,accel=tcg -device spapr-pci-host-bridge


qemu/hw/ppc/spapr_pci.c:1567:spapr_phb_realize: Object 0x55bda99744a0 is not an instance of type spapr-machine
Aborted (core dumped)