cgroup: remove cftype->release()

Now that pidlist files don't use cftype->release(), it doesn't have
any user left.  Remove it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 492fa01ec2d3..5207c28c2402 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -499,8 +499,6 @@ struct cftype {
          * kick type for multiplexing.
          */
         int (*trigger)(struct cgroup_subsys_state *css, unsigned int event);
-
-        int (*release)(struct inode *inode, struct file *file);
 };
 
 /*