Update tests for psa_close_key for invalid key.

Update expected return values of psa_close_key() to
PSA_ERROR_INVALID_HANDLE for invalid key handle operations.

Signed-off-by: Maulik  Patel <Maulik.Patel@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 bafb7d8..9b07c8c 100644
--- a/tests/suites/test_suite_psa_crypto_slot_management.function
+++ b/tests/suites/test_suite_psa_crypto_slot_management.function
@@ -179,7 +179,7 @@
     /* Test that the key is now invalid. */
     TEST_EQUAL( psa_get_key_attributes( key, &attributes ),
                 PSA_ERROR_DOES_NOT_EXIST );
-    TEST_EQUAL( psa_close_key( key ), PSA_ERROR_DOES_NOT_EXIST );
+    TEST_EQUAL( psa_close_key( key ), PSA_ERROR_INVALID_HANDLE );
 
 exit:
     /*
@@ -327,7 +327,7 @@
              */
             TEST_EQUAL( psa_get_key_attributes( handle, &read_attributes ),
                         PSA_ERROR_DOES_NOT_EXIST );
-            TEST_EQUAL( psa_close_key( handle ), PSA_ERROR_DOES_NOT_EXIST );
+            TEST_EQUAL( psa_close_key( handle ), PSA_ERROR_INVALID_HANDLE );
             TEST_EQUAL( psa_get_key_attributes( id, &read_attributes ),
                         PSA_ERROR_DOES_NOT_EXIST );
             break;