[APPLIED] (sort of) string_destroy in string.c

[Alex Gough]

On Thu, 10 Jan 2002, Joshua Nye wrote:

> The read op would segfault if you gave a string register as the first argument that 
>didn't previously have a string value in it.
>
> --- string.c.orig       Thu Jan 10 11:26:39 2002
> +++ string.c    Thu Jan 10 11:27:12 2002
> @@ -71,7 +71,9 @@
>   */
>  void
>  string_destroy(STRING *s) {
> -    free_string(s);
> +    if(s) {
> +        free_string(s);
> +    }
>  }

Thanks for spotting this one.  I think it makes more sense to have
the test in resources.c:free_string itself, then other functions cannot
possibly make the same mistake themselves.  I've made the needed changes.

Alex Gough