cuda: Move ADB bus into CUDA state

Replace the global adb_bus with a CUDA-internal one, accessed using
regular qdev child bus accessor.

Signed-off-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/hw/ppc/mac_newworld.c b/hw/ppc/mac_newworld.c
index 2892b36..6de810b 100644
--- a/hw/ppc/mac_newworld.c
+++ b/hw/ppc/mac_newworld.c
@@ -149,6 +149,7 @@
     PCIBus *pci_bus;
     PCIDevice *macio;
     MACIOIDEState *macio_ide;
+    BusState *adb_bus;
     MacIONVRAMState *nvr;
     int bios_size;
     MemoryRegion *pic_mem, *escc_mem;
@@ -381,9 +382,11 @@
                                                         "ide[1]"));
     macio_ide_init_drives(macio_ide, &hd[MAX_IDE_DEVS]);
 
-    dev = qdev_create(BUS(&adb_bus), TYPE_ADB_KEYBOARD);
+    dev = DEVICE(object_resolve_path_component(OBJECT(macio), "cuda"));
+    adb_bus = qdev_get_child_bus(dev, "adb.0");
+    dev = qdev_create(adb_bus, TYPE_ADB_KEYBOARD);
     qdev_init_nofail(dev);
-    dev = qdev_create(BUS(&adb_bus), TYPE_ADB_MOUSE);
+    dev = qdev_create(adb_bus, TYPE_ADB_MOUSE);
     qdev_init_nofail(dev);
 
     if (usb_enabled(machine_arch == ARCH_MAC99_U3)) {