core: handle client bind errors

When a client attempts to bind to an unexisting global, don't error
but instead let the client know the object was removed.

pinos/server/link.c

@@ -760,6 +760,7 @@ link_bind_func (PinosGlobal *global,
   return SPA_RESULT_OK;
 
 no_mem:
+  pinos_log_error ("can't create link resource");
   pinos_core_notify_error (client->core_resource,
                            client->core_resource->id,
                            SPA_RESULT_NO_MEMORY,