From 6e050778c5d08a97d5d98f7cb62bc503e872615c Mon Sep 17 00:00:00 2001
From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Fri, 14 Dec 2007 00:44:11 +0800
Subject: [PATCH] [CRYPTO] scatterwalk: Handle zero nbytes in
 scatterwalk_map_and_copy

It's better to return silently than crash and burn when someone feeds us
a zero length.  In particular the null digest algorithm when used as part
of authenc will do that to us.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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