Merge "smcinvoke: Return proper error in process_accept_req"

		 * invoke thread died while server was processing cb req.

		 * if invoke thread dies, it would remove req from Q. So

		 * no matching cb_txn would be on Q and hence NULL cb_txn.

		 * In this case, we want this thread to come back and start

		 * waiting for new cb requests, hence return EAGAIN here

		 */

		if (!cb_txn) {

			pr_err("%s txn %d either invalid or removed from Q\n",

					__func__, user_args.txn_id);

			ret = -EAGAIN;

			goto out;

		}

		ret = marshal_out_tzcb_req(&user_args, cb_txn,