sort's -k flag is buggy when M is also passed

[Denys Vlasenko]

Fixed in git. Thank you.

On Wed, Jun 29, 2022 at 7:11 AM Dennis Chen <dchen at dennisc.net> wrote:
>
> All commands were run on both Ubuntu busybox v1.30.1 and Alpine busybox
> v1.35.0.
>
> I ran
>         echo "3 March\n2 April" | busybox sort -k 2,2M
> and it returned
>         2 April
>         3 March
> It should return
>         3 March
>         2 April
> and indeed, that is what you get with GNU sort. (It doesn't seem to
> matter what the numbers "2" and "3" are - I replaced them both with the
> string "filler" and got the same result.)
>
> This seems to only happen when the field number is >1. For instance
>         echo "March\nApril" | busybox sort -k 1,1M
> correctly outputs
>         March
>         April
>
> It also doesn't happen when M isn't passed into -k. For instance,
>         echo "a c\nb b" | sort -k 2,2
> correctly returns
>         b b
>         a c
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