Fix #147878: bad usage inferencing when there is a link cycle

The inferencing algorithm does not work reliably when the tree has cycles. So
return early and assume everything is used. The user is expected to fix the bad
link as soon as possible.

Pull Request: https://projects.blender.org/blender/blender/pulls/148009

source/blender/nodes/intern/socket_usage_inference.cc

@@ -767,6 +767,10 @@ Array<SocketUsage> infer_all_sockets_usage(const bNodeTree &tree)
   const Span<const bNodeSocket *> all_output_sockets = tree.all_output_sockets();
   Array<SocketUsage> all_usages(tree.all_sockets().size());
 
+  if (tree.has_available_link_cycle()) {
+    return all_usages;
+  }
+
   ResourceScope scope;
   bke::ComputeContextCache compute_context_cache;