rem: int n_pos;
add: size_t n_pos;
context: dired_dump_obstack (const char *prefix, struct obstack *os){  int n_pos;  n_pos = obstack_object_size (os) / sizeof (dired_pos);  if (n_pos > 0)    {      int i;      size_t *pos;      pos = (size_t *) obstack_finish (os);      fputs (prefix, stdout);      for (i = 0; i < n_pos; i++)	printf (" %lu", (unsigned long) pos[i]);      putchar ('\n');    }}