Fix Warning introduced in changeset

e1a018e6 ("crypto: chelsio - Remove dst sg size zero check")
Reported-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NHarsh Jain <harsh@chelsio.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>