qom: Assert that objects being destroyed have no parent

QOM reference counting bugs are often hard to detect, but there's
one kind of bug that's easier: if we are freeing an object but is
still attached to a parent, it means the reference count is wrong
(because the parent always hold a reference to their children).

Add an assertion to make sure we detect those cases.

Signed-off-by: Eduardo Habkost <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

qom/object.c

@@ -685,6 +685,7 @@ static void object_finalize(void *data)
     object_deinit(obj, ti);
 
     g_assert(obj->ref == 0);
+    g_assert(obj->parent == NULL);
     if (obj->free) {
         obj->free(obj);
     }