hw/a*: pass owner to memory_region_init* functions

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/hw/audio/cs4231.c b/hw/audio/cs4231.c
index fb9b700..fabe9e6 100644
--- a/hw/audio/cs4231.c
+++ b/hw/audio/cs4231.c
@@ -144,7 +144,8 @@
 {
     CSState *s = FROM_SYSBUS(CSState, dev);
 
-    memory_region_init_io(&s->iomem, NULL, &cs_mem_ops, s, "cs4321", CS_SIZE);
+    memory_region_init_io(&s->iomem, OBJECT(s), &cs_mem_ops, s, "cs4321",
+                          CS_SIZE);
     sysbus_init_mmio(dev, &s->iomem);
     sysbus_init_irq(dev, &s->irq);