Update: Ensure f_fll_id_t.name is always NULL terminated.

Update: Ensure f_fll_id_t.name is always NULL terminated.

Set the normal length of `f_fll_id_name_length_d` to 63.
Then have the actual max length remain at 64 via newly added `f_fll_id_name_max_length_d`.

The `f_fll_id_name_length_d` is only used for comparisons now.
The `f_fll_id_name_max_length_d` is used on the structure.
This should prevent **API** and **ABI** breakage.

Add missing close parenthesis in documentation comment.