btrfs: fix comment its device list mutex not volume lock

We have killed volume mutex (commit: dccdb07bc9
btrfs: kill btrfs_fs_info::volume_mutex). This a trival one seems to have
escaped.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2019-02-08 15:39:37 +08:00 • committed by David Sterba
commit 7faad6e25c