Set deterministic flags for NULL profile

Previously flags was left to whatever value it had before. It's cleaner to
make sure it has a definite value, and all bits set looks like the safest way
for when it went very wrong.
diff --git a/tests/suites/test_suite_x509parse.data b/tests/suites/test_suite_x509parse.data
index 4ba948c..2b59651 100644
--- a/tests/suites/test_suite_x509parse.data
+++ b/tests/suites/test_suite_x509parse.data
@@ -1278,6 +1278,10 @@
 depends_on:MBEDTLS_SHA256_C:MBEDTLS_ECDSA_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED
 mbedtls_x509_crt_verify_chain:"data_files/dir4/cert92.crt":"data_files/dir4/cert91.crt":0:0:""
 
+X509 CRT verify chain #11 (valid chain, missing profile)
+depends_on:MBEDTLS_SHA256_C:MBEDTLS_ECDSA_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED
+mbedtls_x509_crt_verify_chain:"data_files/dir4/cert92.crt":"data_files/dir4/cert91.crt":-1:MBEDTLS_ERR_X509_BAD_INPUT_DATA:"nonesuch"
+
 X509 OID description #1
 x509_oid_desc:"2B06010505070301":"TLS Web Server Authentication"