net: Convert net filter code to use object property iterators

Stop directly accessing the Object::properties field data
structure and instead use the formal object property iterator
APIs. This insulates the code from future data structure
changes in the Object struct.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Tested-by: Pavel Fedin <p.fedin@samsung.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>

net/filter.c

@@ -137,6 +137,7 @@ static void netfilter_complete(UserCreatable *uc, Error **errp)
     Error *local_err = NULL;
     char *str, *info;
     ObjectProperty *prop;
+    ObjectPropertyIterator *iter;
     StringOutputVisitor *ov;
 
     if (!nf->netdev_id) {
@@ -173,7 +174,8 @@ static void netfilter_complete(UserCreatable *uc, Error **errp)
     QTAILQ_INSERT_TAIL(&nf->netdev->filters, nf, next);
 
     /* generate info str */
-    QTAILQ_FOREACH(prop, &OBJECT(nf)->properties, node) {
+    iter = object_property_iter_init(OBJECT(nf));
+    while ((prop = object_property_iter_next(iter))) {
         if (!strcmp(prop->name, "type")) {
             continue;
         }
@@ -187,6 +189,7 @@ static void netfilter_complete(UserCreatable *uc, Error **errp)
         g_free(str);
         g_free(info);
     }
+    object_property_iter_free(iter);
 }
 
 static void netfilter_finalize(Object *obj)