btrfs: drop chunk locks at the end of close_ctree

The pinned chunks might be left over so we clean them but at this point
of close_ctree, there's noone to race with, the locking can be removed.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2017-06-22 03:59:40 +02:00
commit 4958aa6821