memory: add owner argument to initialization functions

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/hw/misc/omap_sdrc.c b/hw/misc/omap_sdrc.c
index e38b571..ed62caf 100644
--- a/hw/misc/omap_sdrc.c
+++ b/hw/misc/omap_sdrc.c
@@ -161,7 +161,7 @@
 
     omap_sdrc_reset(s);
 
-    memory_region_init_io(&s->iomem, &omap_sdrc_ops, s, "omap.sdrc", 0x1000);
+    memory_region_init_io(&s->iomem, NULL, &omap_sdrc_ops, s, "omap.sdrc", 0x1000);
     memory_region_add_subregion(sysmem, base, &s->iomem);
 
     return s;