hw/pci: fixed error flow in pci_qdev_init Verify return code for pci_add_option_rom. Signed-off-by: Marcel Apfelbaum <marcel.a@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com>