Remove unnecessary TEST_CF_PUBLIC macro call

Signed-off-by: David Horstmann <david.horstmann@arm.com>
diff --git a/tests/suites/test_suite_cipher.function b/tests/suites/test_suite_cipher.function
index 3eb4625..2856ae5 100644
--- a/tests/suites/test_suite_cipher.function
+++ b/tests/suites/test_suite_cipher.function
@@ -1274,7 +1274,6 @@
     TEST_CF_SECRET(decrypted_block->x, decrypted_block->len);
     ret = mbedtls_get_pkcs_padding(decrypted_block->x, decrypted_block->len,
                                    &calculated_len);
-    TEST_CF_PUBLIC(decrypted_block->x, decrypted_block->len);
 
     TEST_EQUAL(ret, exp_ret);
     if (exp_ret == 0) {