qemu: Add missing checks for pcie-root-port options

We format the 'chassis' and 'port' properties on the QEMU command
line later on, so we should make sure they've been set.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>

src/qemu/qemu_command.c

@@ -2816,7 +2816,9 @@ qemuBuildControllerDevStr(const virDomainDef *domainDef,
             break;
         case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_ROOT_PORT:
             if (def->opts.pciopts.modelName
-                == VIR_DOMAIN_CONTROLLER_PCI_MODEL_NAME_NONE) {
+                == VIR_DOMAIN_CONTROLLER_PCI_MODEL_NAME_NONE ||
+                def->opts.pciopts.chassis == -1 ||
+                def->opts.pciopts.port == -1) {
                 virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                                _("autogenerated pcie-root-port options not set"));
                 goto error;