[Review] xtest: add --clear-storage option

Fix error handling.

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>

ta/storage/storage.c

@@ -691,16 +691,20 @@ static TEE_Result clear_storage(uint32_t storage_id)
 	if (res)
 		goto out;
 	obj_id = TEE_Malloc(TEE_OBJECT_ID_MAX_LEN, 0);
-	if (!obj_id)
+	if (!obj_id) {
+		res = TEE_ERROR_OUT_OF_MEMORY;
 		goto out;
+	}
 
 	while (true) {
 		enum_res = TEE_GetNextPersistentObject(oe, &oi, obj_id,
 						       &obj_id_sz);
 		if (enum_res == TEE_ERROR_ITEM_NOT_FOUND)
 			break;
-		if (enum_res)
+		if (enum_res) {
+			res = enum_res;
 			break;
+		}
 		IMSG("Deleting persistent object #%zu", i);
 		res = TEE_OpenPersistentObject(storage_id, obj_id, obj_id_sz,
 					       TEE_DATA_FLAG_ACCESS_WRITE_META,