relay_process_msg
KUNIT_ASSERT_EQ(test, -EPROTO, relay_process_msg(relay, TEST_VFID, TEST_RID, &msg, 0));
KUNIT_ASSERT_EQ(test, -EPROTO, relay_process_msg(relay, TEST_VFID, TEST_RID, msg, len));
KUNIT_ASSERT_EQ(test, -EBADRQC, relay_process_msg(relay, TEST_VFID, TEST_RID, msg, len));
return relay_process_msg(relay, PFID, rid,
err = relay_process_msg(relay, origin, rid,