btrfs: Remove never-reached WARN_ON

We have a WARN_ON(!var) inside an if branch which is executed (among
others) only when var is true.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2017-08-17 10:52:28 +03:00 • committed by David Sterba
commit 92ac58ec99