Fix false-positive non-const-time errors in test

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/tests/suites/test_suite_constant_time.function b/tests/suites/test_suite_constant_time.function
index cce5b84..dbcc9f7 100644
--- a/tests/suites/test_suite_constant_time.function
+++ b/tests/suites/test_suite_constant_time.function
@@ -77,13 +77,13 @@
     expected = x1 <= y1 ? MBEDTLS_CT_TRUE : MBEDTLS_CT_FALSE;
     TEST_EQUAL(mbedtls_ct_bool_le(x, y), expected);
 
-    expected = mbedtls_ct_bool(x) ^ mbedtls_ct_bool(y) ? MBEDTLS_CT_TRUE : MBEDTLS_CT_FALSE;
+    expected = mbedtls_ct_bool(x1) ^ mbedtls_ct_bool(y1) ? MBEDTLS_CT_TRUE : MBEDTLS_CT_FALSE;
     TEST_EQUAL(mbedtls_ct_bool_xor(mbedtls_ct_bool(x), mbedtls_ct_bool(y)), expected);
 
-    expected = mbedtls_ct_bool(x) & mbedtls_ct_bool(y) ? MBEDTLS_CT_TRUE : MBEDTLS_CT_FALSE;
+    expected = mbedtls_ct_bool(x1) & mbedtls_ct_bool(y1) ? MBEDTLS_CT_TRUE : MBEDTLS_CT_FALSE;
     TEST_EQUAL(mbedtls_ct_bool_and(mbedtls_ct_bool(x), mbedtls_ct_bool(y)), expected);
 
-    expected = mbedtls_ct_bool(x) | mbedtls_ct_bool(y) ? MBEDTLS_CT_TRUE : MBEDTLS_CT_FALSE;
+    expected = mbedtls_ct_bool(x1) | mbedtls_ct_bool(y1) ? MBEDTLS_CT_TRUE : MBEDTLS_CT_FALSE;
     TEST_EQUAL(mbedtls_ct_bool_or(mbedtls_ct_bool(x), mbedtls_ct_bool(y)), expected);
 
     TEST_CF_PUBLIC(&x, sizeof(x));