tests: Fix persistent slot lifecycle tests

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/tests/suites/test_suite_psa_crypto_slot_management.function b/tests/suites/test_suite_psa_crypto_slot_management.function
index fe3e5f9..12cf3ea 100644
--- a/tests/suites/test_suite_psa_crypto_slot_management.function
+++ b/tests/suites/test_suite_psa_crypto_slot_management.function
@@ -251,12 +251,6 @@
     if( ! invalidate_psa( close_method ) )
         goto exit;
 
-    /* Test that the handle is now invalid. */
-    TEST_EQUAL( psa_get_key_attributes( handle, &read_attributes ),
-                PSA_ERROR_DOES_NOT_EXIST );
-    psa_reset_key_attributes( &read_attributes );
-    TEST_EQUAL( psa_close_key( handle ), PSA_ERROR_DOES_NOT_EXIST );
-
     /* Try to reopen the key. If we destroyed it, check that it doesn't
      * exist. Otherwise check that it still exists and has the expected
      * content. */