conf: honor maxnames in nodeListDevices API

Introduced by commit <4ae9dbea99c>.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1528572

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>

src/conf/virnodedeviceobj.c

@@ -798,6 +798,9 @@ virNodeDeviceObjListGetNamesCallback(void *payload,
     if (data->error)
         return 0;
 
+    if (data->nnames >= data->maxnames)
+        return 0;
+
     virObjectLock(obj);
     def = obj->def;