Changed all occurences of (1<<31) to (1u<<31). Thanks Eliska Svobodova.

xorriso/read_run.c

@@ -1509,7 +1509,7 @@ ex:
  if(link_target!=NULL)
    free(link_target);
  Xorriso_findi_iter(xorriso, dir, &mem, &iter, &node_array, &node_count,
-                    &node_idx, &node, (1<<31));
+                    &node_idx, &node, (1u<<31));
 
  Xorriso_process_msg_queues(xorriso,0);