We're clearing the wrong memory.  The memory corruption is likely
harmless because we weren't going to use that stack memory again but not
zeroing is a potential information leak.

Fixes: e28facde ('crypto: keywrap - add key wrapping block chaining mode')
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Acked-by: NStephan Mueller <smueller@chronox.de>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>