memory: add opaque parameter to memory_region_init_rom_device()

The MemoryRegionOps callbacks expect it.

Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/memory.h b/memory.h
index 0553cc7..06b83ae 100644
--- a/memory.h
+++ b/memory.h
@@ -235,6 +235,7 @@
  */
 void memory_region_init_rom_device(MemoryRegion *mr,
                                    const MemoryRegionOps *ops,
+                                   void *opaque,
                                    DeviceState *dev, /* FIXME: layering violation */
                                    const char *name,
                                    uint64_t size);