btrfs: drop null testing before destroy functions

Cleanup.

kmem_cache_destroy has support NULL argument checking,
so drop the double null testing before calling it.

Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Kinglong Mee 2016-01-29 21:36:35 +08:00 • committed by David Sterba
commit 5598e9005a
9 changed files with 17 additions and 34 deletions