msvcirt: Avoid superfluous comparison in some compilers

[Henri Verbeet]

On 27 March 2016 at 13:57, Iván Matellanes <matellanesivan at gmail.com> wrote:
> -    if (dir < SEEKDIR_beg || dir > SEEKDIR_end || !(mode & (OPENMODE_in|OPENMODE_out)))
> +    if ((dir != SEEKDIR_beg && dir != SEEKDIR_cur && dir != SEEKDIR_end) || !(mode & (OPENMODE_in|OPENMODE_out)))
I'm not sure you're really making it better by adding another
comparison. One alternative you may want to consider is just
"(unsigned int)dir > SEEKDIR_end".