libnm: fix secret-name parameter in NMSettingClearSecretsWithFlagsFn for VPN

The secret name should be the one that we can pass to nm_setting_get_secret_flags().
It's wrong to call the function repeatedly with secret-name "secrets".

Probably nobody cared anyway about the name. nm_connection_clear_secrets_with_func()
is used to clear secrets based on the flags, not the secret-name.

Fixes: 2b2404bbef

libnm-core/nm-setting-vpn.c

@@ -832,7 +832,7 @@ clear_secrets_with_flags (NMSetting *setting,
 		NMSettingSecretFlags flags = NM_SETTING_SECRET_FLAG_NONE;
 
 		nm_setting_get_secret_flags (setting, secret, &flags, NULL);
-		if (func (setting, pspec->name, flags, user_data) == TRUE) {
+		if (func (setting, secret, flags, user_data) == TRUE) {
 			g_hash_table_iter_remove (&iter);
 			changed = TRUE;
 		}