scd: pinpad input improvements

[NIIBE Yutaka]

On 2013-10-16 at 10:05 +0900, NIIBE Yutaka wrote:
> For the issue 1549, I commit and pushed my changes for scd/apdu.c.
> The bug was introduced by me when I added PINMIN/PINMAX handling
> and I forgot to remove old code (which should have removed).
> 
>    https://bugs.g10code.com/gnupg/issue1549

I pushed another fix today.  It was applied both to stable and master.
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