devices opened by check_mounted() in main() should close before
exit of btrfs-image.

Signed-off-by: Zhao Lei <zhao...@cn.fujitsu.com>
---
 btrfs-image.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/btrfs-image.c b/btrfs-image.c
index c7681f4..78ae828 100644
--- a/btrfs-image.c
+++ b/btrfs-image.c
@@ -2881,5 +2881,7 @@ out:
                }
        }
 
+       btrfs_close_all_devices();
+
        return !!ret;
 }
-- 
1.8.5.1

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