crypto: qat - Use helper to set reqsize

[ Upstream commit 80e62ad5 ]

The value of reqsize must only be changed through the helper.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Stable-dep-of: eb7713f5 ("crypto: qat - unmap buffer before free for DH")
Signed-off-by: Sasha Levin <sashal@kernel.org>