ssh: Fix allocation of pinentry buffer

[NIIBE Yutaka]

On 09/29/2015 11:08 AM, NIIBE Yutaka wrote:
> I think that this is good for the fix for minimum impact.  I added a
> comment at MAX_PASSPHRASE_LEN.

I'd like to commit this change to master, and to backport it to 2.0.

Since the size was smaller, 2.0 doesn't dump core (for some OS),
but same bug is there.

Then, for master, improvement can be considered later, if needed.

OK to commit?
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