memory: add owner argument to initialization functions

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/hw/timer/omap_synctimer.c b/hw/timer/omap_synctimer.c
index a24f35c..a12aca2 100644
--- a/hw/timer/omap_synctimer.c
+++ b/hw/timer/omap_synctimer.c
@@ -94,7 +94,7 @@
     struct omap_synctimer_s *s = g_malloc0(sizeof(*s));
 
     omap_synctimer_reset(s);
-    memory_region_init_io(&s->iomem, &omap_synctimer_ops, s, "omap.synctimer",
+    memory_region_init_io(&s->iomem, NULL, &omap_synctimer_ops, s, "omap.synctimer",
                           omap_l4_region_size(ta, 0));
     omap_l4_attach(ta, 0, &s->iomem);