From 81c92940c1645be9f9d87958e7f02395f0a15b39 Mon Sep 17 00:00:00 2001
From: Axel Burri <axel@tty0.ch>
Date: Mon, 19 Oct 2020 00:34:11 +0200
Subject: [PATCH] btrbk: fix unitialized value in warning

Regression from: 5c32ced7d6
---
 btrbk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/btrbk b/btrbk
index a56a907..183ce7e 100755
--- a/btrbk
+++ b/btrbk
@@ -2364,7 +2364,7 @@ sub btr_tree($$$$)
     my $node_id = $_->{MNTOPS}{subvolid};
     my $node = $id{$node_id};
     unless($node) {
-      WARN "Unknown subvolid=$_->{subvolid} (in btrfs tree of $host_mount_source) for mountpoint: $vol->{URL_PREFIX}$_->{mount_point}";
+      WARN "Unknown subvolid=$node_id (in btrfs tree of $host_mount_source) for mountpoint: $vol->{URL_PREFIX}$_->{mount_point}";
       next;
     }
     $mountpoints_hash{$node_id} = $node;