crypto: ccree - zero out internal struct before use

[ Upstream commit 9f31eb6e08cc1b0eb3926eebf4c51467479a7722 ]

We did not zero out the internal struct before use causing problem
in some rare error code paths.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>