rem: new_ent.name = filename;
add: new_ent.name = (char *) filename;
context: seen_file (Hash_table const *ht, char const *filename,	   struct stat const *stats){  struct F_triple new_ent;  if (ht == NULL)    return 0;  new_ent.name = filename;  new_ent.st_ino = stats->st_ino;  new_ent.st_dev = stats->st_dev;  return !!hash_lookup (ht, &new_ent);}