tls: Only use data field in crypto completion function

[ Upstream commit 8d338c76

 ]

The crypto_async_request passed to the completion is not guaranteed
to be the original request object.  Only the data field can be relied
upon.

Fix this by storing the socket pointer with the AEAD request.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Stable-dep-of: a2713257

 ("tls: Use size_add() in call to struct_size()")
Signed-off-by: Sasha Levin <sashal@kernel.org>