tests: make utiltest:t_cmp_guid succeed on s390x

memcmp was given the wrong buffer to check for byteorder.

Fixes: gromox-2.4-47-g3acd4a722

Author: jengelh

tests/utiltest.cpp

@@ -311,13 +311,13 @@ static int t_cmp_guid()
 	ep.init(buf, sizeof(buf), 0);
 	if (ep.p_guid(PSETID_Address) != pack_result::success)
 		return EXIT_FAILURE;
-	assert(memcmp(&PSETID_Address, "\x04\x20\x06\x00", 4) == 0);
+	assert(memcmp(ep.m_udata, "\x04\x20\x06\x00", 4) == 0);
 	static_assert(std::is_same_v<decltype(PSETID_Address), const GUID>);
 
 	ep.init(buf, sizeof(buf), 0);
 	if (ep.p_guid(muidEMSAB) != EXT_ERR_SUCCESS)
 		return EXIT_FAILURE;
-	assert(memcmp(&muidEMSAB, "\xDC\xA7\x40\xC8", 4) == 0);
+	assert(memcmp(ep.m_udata, "\xDC\xA7\x40\xC8", 4) == 0);
 	static_assert(std::is_same_v<decltype(muidEMSAB), const FLATUID>);
 	return EXIT_SUCCESS;
 }