platform/chrome: cros_ec_proto: change Kunit expectation when timed out

While EC_COMMS_STATUS_PROCESSING flag is still on after it tries
EC_COMMAND_RETRIES times for sending EC_CMD_GET_COMMS_STATUS,
cros_ec_wait_until_complete() doesn't return an error code.

Change the expectation to an error code.
Reviewed-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://lore.kernel.org/r/20220718050914.2267370-8-tzungbi@kernel.org

drivers/platform/chrome/cros_ec_proto_test.c

@@ -1870,9 +1870,7 @@ static void cros_ec_proto_test_cmd_xfer_in_progress_retries_status_processing(st
 	}
 
 	ret = cros_ec_cmd_xfer(ec_dev, &msg);
-	KUNIT_EXPECT_EQ(test, ret, sizeof(struct ec_response_get_comms_status));
-
-	KUNIT_EXPECT_EQ(test, msg.result, EC_RES_SUCCESS);
+	KUNIT_EXPECT_EQ(test, ret, -EAGAIN);
 
 	/* For EC_CMD_GET_COMMS_STATUS EC_COMMAND_RETRIES times. */
 	KUNIT_EXPECT_EQ(test, cros_kunit_ec_pkt_xfer_mock_called, 51);