[PATCH] btrfs: fix comment in reserved space warning

[Dan Johnson <computerdruid@gmail.com>]

mkfs.btrfs up to v4.14 actually can leave a chunk inside the reserved
space when invoked with `-m single`, fixed by 997f9977c24397eb6980bb9
("mkfs: Prevent temporary system chunk to use space in reserved 1M
range") released with v4.15.

Signed-off-by: Dan Johnson <ComputerDruid@gmail.com>
---
 fs/btrfs/volumes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 4d5c5908300..28521015d01 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -7989,7 +7989,7 @@ static int verify_one_dev_extent(struct btrfs_fs_info *fs_info,
 	}
 
 	/*
-	 * Very old mkfs.btrfs (before v4.1) will not respect the reserved
+	 * Very old mkfs.btrfs (before v4.15) will not respect the reserved
 	 * space. Although kernel can handle it without problem, better to warn
 	 * the users.
 	 */
-- 
2.49.0