tree b58022ec4378bbfb51291c68da914ce64a526db8
parent ce5bd4aca3c467936370846119b7f3daf9ccea78
author Herbert Xu <herbert@gondor.apana.org.au> 1197564251 +0800
committer Herbert Xu <herbert@gondor.apana.org.au> 1199999814 +1100

[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>