cgroup: remove dead code in cgroup_get_rootdir()

Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com>
Acked-by: NPaul Menage <menage@google.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

kernel/cgroup.c

@@ -919,7 +919,6 @@ static int cgroup_get_rootdir(struct super_block *sb)
 	if (!inode)
 		return -ENOMEM;
 
-	inode->i_op = &simple_dir_inode_operations;
 	inode->i_fop = &simple_dir_operations;
 	inode->i_op = &cgroup_dir_inode_operations;
 	/* directories start off with i_nlink == 2 (for "." entry) */