bug#27782: patch for mmap and friends

[Matt Wette]

On 1/14/23 2:42 PM, Maxime Devos wrote:
>     {
>       /* Use the fd of the port under clobber protection from
>          concurrency. As scm_dynwind_acquire_port assumes that
>          FILE is a port, check that first. */
>       SCM_VALIDATE_PORT (SCM_ARG5, file);
>       scm_dynwind_acquire_port (file);
>       c_fd = scm_fileno (file);
>     }

Thanks.  I'll try this, modulo update to  scm_to_int (scm_fileno (file)).

Matt