virtio-mmio: Drop useless bus->allow_hotplug = 0

Bus by default is not hotpluggable.
virtio-mmio-bus and its parent types do not set allow_hotplug
anywhere explicitly, so remove not needed field access
and wrapper along with it.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>

hw/virtio/virtio-mmio.c

@@ -89,9 +89,6 @@ typedef struct {
     VirtioBusState bus;
 } VirtIOMMIOProxy;
 
-static void virtio_mmio_bus_new(VirtioBusState *bus, size_t bus_size,
-                                VirtIOMMIOProxy *dev);
-
 static uint64_t virtio_mmio_read(void *opaque, hwaddr offset, unsigned size)
 {
     VirtIOMMIOProxy *proxy = (VirtIOMMIOProxy *)opaque;
@@ -362,7 +359,8 @@ static void virtio_mmio_realizefn(DeviceState *d, Error **errp)
     VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
     SysBusDevice *sbd = SYS_BUS_DEVICE(d);
 
-    virtio_mmio_bus_new(&proxy->bus, sizeof(proxy->bus), proxy);
+    qbus_create_inplace(&proxy->bus, sizeof(proxy->bus), TYPE_VIRTIO_MMIO_BUS,
+                        d, NULL);
     sysbus_init_irq(sbd, &proxy->irq);
     memory_region_init_io(&proxy->iomem, OBJECT(d), &virtio_mem_ops, proxy,
                           TYPE_VIRTIO_MMIO, 0x200);
@@ -393,17 +391,6 @@ static const TypeInfo virtio_mmio_info = {
 
 /* virtio-mmio-bus. */
 
-static void virtio_mmio_bus_new(VirtioBusState *bus, size_t bus_size,
-                                VirtIOMMIOProxy *dev)
-{
-    DeviceState *qdev = DEVICE(dev);
-    BusState *qbus;
-
-    qbus_create_inplace(bus, bus_size, TYPE_VIRTIO_MMIO_BUS, qdev, NULL);
-    qbus = BUS(bus);
-    qbus->allow_hotplug = 0;
-}
-
 static void virtio_mmio_bus_class_init(ObjectClass *klass, void *data)
 {
     BusClass *bus_class = BUS_CLASS(klass);