[PATCH RFC 2/6] purgatory: No need to sha256 update if ptr->len is zero

[Geoff Levand]

On Thu, 2015-04-16 at 22:17 +0530, Pratyush Anand wrote:
> If ptr->len is zero we do not need to update sha256.

Looks OK.  Did you find this sped things up?

Acked-by: Geoff Levand <geoff at infradead.org>