test_suite_psa_crypto_util: add test with 0-length for r

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/tests/suites/test_suite_psa_crypto_util.data b/tests/suites/test_suite_psa_crypto_util.data
index 49b4919..78f048a 100644
--- a/tests/suites/test_suite_psa_crypto_util.data
+++ b/tests/suites/test_suite_psa_crypto_util.data
@@ -70,6 +70,10 @@
 depends_on:PSA_WANT_ECC_SECP_K1_256
 ecdsa_der_to_raw:256:"302502010002202222222222222222222222222222222222222222222222222222222222222222":"11111111111111111111111111111111111111111111111111111111111111112222222222222222222222222222222222222222222222222222222222222222":MBEDTLS_ERR_ASN1_LENGTH_MISMATCH
 
+ECDSA DER -> Raw, 256bit, Invalid r (0-length)
+depends_on:PSA_WANT_ECC_SECP_K1_256
+ecdsa_der_to_raw:256:"3025020002202222222222222222222222222222222222222222222222222222222222222222":"11111111111111111111111111111111111111111111111111111111111111112222222222222222222222222222222222222222222222222222222222222222":MBEDTLS_ERR_ASN1_OUT_OF_DATA
+
 # 512/521 bit sizes are useful to test sequence's length encoded with 2 bytes.
 ECDSA Raw -> DER, 512bit, Success
 depends_on:PSA_WANT_ECC_BRAINPOOL_P_R1_512