hw/usb: Convert to qdev_realize()

Device code shouldn't mess with QOM property "realized" since we have
proper interfaces (merge commit 6675a653).  Commit 8ddab8dd3d
"usb/hcd-xhci: Split pci wrapper for xhci base model" and commit
f00ff136ee "usb: hcd-xhci-sysbus: Attach xhci to sysbus device"
reintroduced two instances.  Clean them up.  Note that s->xhci is
a (bus-less) TYPE_XHCI device.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20210119120151.53757-1-armbru@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

hw/usb/hcd-xhci-pci.c

@@ -115,9 +115,7 @@ static void usb_xhci_pci_realize(struct PCIDevice *dev, Error **errp)
     object_property_set_link(OBJECT(&s->xhci), "host", OBJECT(s), NULL);
     s->xhci.intr_update = xhci_pci_intr_update;
     s->xhci.intr_raise = xhci_pci_intr_raise;
-    object_property_set_bool(OBJECT(&s->xhci), "realized", true, &err);
-    if (err) {
-        error_propagate(errp, err);
+    if (!qdev_realize(DEVICE(&s->xhci), NULL, errp)) {
         return;
     }
     if (strcmp(object_get_typename(OBJECT(dev)), TYPE_NEC_XHCI) == 0) {

hw/usb/hcd-xhci-sysbus.c

@@ -33,12 +33,9 @@ void xhci_sysbus_reset(DeviceState *dev)
 static void xhci_sysbus_realize(DeviceState *dev, Error **errp)
 {
     XHCISysbusState *s = XHCI_SYSBUS(dev);
-    Error *err = NULL;
 
     object_property_set_link(OBJECT(&s->xhci), "host", OBJECT(s), NULL);
-    object_property_set_bool(OBJECT(&s->xhci), "realized", true, &err);
-    if (err) {
-        error_propagate(errp, err);
+    if (!qdev_realize(DEVICE(&s->xhci), NULL, errp)) {
         return;
     }
     s->irq = g_new0(qemu_irq, s->xhci.numintrs);