From 5e5409f48b5403d2c6dffd9919b35ad77d6fb7b4 Mon Sep 17 00:00:00 2001
From: Joe Thornber <ejt@redhat.com>
Date: Wed, 5 Jun 2019 11:07:28 +0100
Subject: [PATCH] [space-map/noop] Be explicit about returning an optional

Needed for older version of g++
---
 persistent-data/space-maps/noop.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/persistent-data/space-maps/noop.h b/persistent-data/space-maps/noop.h
index 500dae8..6f71290 100644
--- a/persistent-data/space-maps/noop.h
+++ b/persistent-data/space-maps/noop.h
@@ -61,7 +61,7 @@ namespace persistent_data {
 
 		maybe_block find_free(span_iterator &it) {
 			fail();
-			return 0;
+			return boost::optional<block_address>(0);
 		}
 
 		bool count_possibly_greater_than_one(block_address b) const {