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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: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>