isa: add memory space parameter to isa_bus_new

Currently, keep current behaviour by always using get_system_memory().

Also use QOM casts when possible.

Signed-off-by: Hervé Poussineau <hpoussin@reactos.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Leon Alrae <leon.alrae@imgtec.com>
diff --git a/hw/isa/vt82c686.c b/hw/isa/vt82c686.c
index 17510ce..b223526 100644
--- a/hw/isa/vt82c686.c
+++ b/hw/isa/vt82c686.c
@@ -429,7 +429,8 @@
     uint8_t *wmask;
     int i;
 
-    isa_bus = isa_bus_new(&d->qdev, pci_address_space_io(d));
+    isa_bus = isa_bus_new(DEVICE(d), get_system_memory(),
+                          pci_address_space_io(d));
 
     pci_conf = d->config;
     pci_config_set_prog_interface(pci_conf, 0x0);