[File] Negative sizes for 128x128 ico files

[Christos Zoulas]

Fixed, thanks!
christos

> On Mar 2, 2025, at 6:48 AM, Christoph Biedl <astron.com.bwoj at manchmal.in-ulm.de> wrote:
> 
> Hello,
> 
> Debian bug report <https://bugs.debian.org/1098991> (has also a download
> link for reproducers).
> 
> It seems icon files with a size of 128x128 are printed with a negative
> value, i.e. "-128x-128". It seems just making the type unsigned does the
> trick, or:
> 
> --- a/magic/Magdir/msdos
> +++ b/magic/Magdir/msdos
> @@ -2115,9 +2115,9 @@
> #      display shared information of cursor or icon entry
> 0              name            cur-ico-entry
>> 0             byte            =0              \b, 256x
> ->0             byte            !0              \b, %dx
> +>0             ubyte           !0              \b, %dx
>> 1             byte            =0              \b256
> ->1             byte            !0              \b%d
> +>1             ubyte           !0              \b%d
> # number of colors in palette
>> 2             ubyte           !0              \b, %d colors
> # reserved 0 FFh
> 
> Regards,
> 
>    Christoph
> -- 
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