isa: Pass i/o address space to isa_bus_new

Not used yet, but at least we're provided with the correct region.

Signed-off-by: Richard Henderson <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
diff --git a/hw/piix4.c b/hw/piix4.c
index 9590e7b..2fd1171 100644
--- a/hw/piix4.c
+++ b/hw/piix4.c
@@ -87,7 +87,7 @@
 {
     PIIX4State *d = DO_UPCAST(PIIX4State, dev, dev);
 
-    isa_bus_new(&d->dev.qdev);
+    isa_bus_new(&d->dev.qdev, pci_address_space_io(dev));
     piix4_dev = &d->dev;
     qemu_register_reset(piix4_reset, d);
     return 0;