test: pake: minor enhancement for opaque keys

Signed-off-by: Valerio Setti <vsetti@baylibre.com>
diff --git a/tests/suites/test_suite_ssl.function b/tests/suites/test_suite_ssl.function
index 01d4fe3..2262041 100644
--- a/tests/suites/test_suite_ssl.function
+++ b/tests/suites/test_suite_ssl.function
@@ -6247,6 +6247,9 @@
 
         ECJPAKE_TEST_SET_PASSWORD( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
 
+        /* check that the opaque key is still valid after failure */
+        TEST_ASSERT( ! mbedtls_svc_key_id_is_null( pwd_slot ) );
+
         psa_destroy_key( pwd_slot );
 
         /* Then set the correct usage */