QOM-ify further.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 hw/char/serial.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/hw/char/serial.c b/hw/char/serial.c
index fb0dd98103..143e39c1b1 100644
--- a/hw/char/serial.c
+++ b/hw/char/serial.c
@@ -990,8 +990,7 @@ SerialState *serial_init(int base, qemu_irq irq, int baudbase,
     s->baudbase = baudbase;
     qemu_chr_fe_init(&s->chr, chr, &error_abort);
     serial_realize_core(s, &error_fatal);
-
-    vmstate_register(NULL, base, &vmstate_serial, s);
+    qdev_set_legacy_instance_id(dev, base, 2);
     qdev_init_nofail(dev);
 
     memory_region_init_io(&s->io, NULL, &serial_io_ops, s, "serial", 8);
@@ -1005,6 +1004,7 @@ static void serial_class_init(ObjectClass *klass, void* data)
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     dc->user_creatable = false;
+    dc->vmsd = &vmstate_serial;
 }
 
 static const TypeInfo serial_info = {
@@ -1068,7 +1068,7 @@ SerialState *serial_mm_init(MemoryRegion *address_space,
     qemu_chr_fe_init(&s->chr, chr, &error_abort);
 
     serial_realize_core(s, &error_fatal);
-    vmstate_register(NULL, base, &vmstate_serial, s);
+    qdev_set_legacy_instance_id(DEVICE(s), base, 2);
     qdev_init_nofail(dev);
 
     memory_region_init_io(&s->io, NULL, &serial_mm_ops[end], s,
-- 
2.23.0.606.g08da6496b6