securityfs: switch to ->free_inode()

static struct vfsmount *mount;

static int mount_count;

static void securityfs_i_callback(struct rcu_head *head)

static void securityfs_free_inode(struct inode *inode)

{

	struct inode *inode = container_of(head, struct inode, i_rcu);

	if (S_ISLNK(inode->i_mode))

		kfree(inode->i_link);

	free_inode_nonrcu(inode);

}

static void securityfs_destroy_inode(struct inode *inode)

{

	call_rcu(&inode->i_rcu, securityfs_i_callback);

}

static const struct super_operations securityfs_super_operations = {

	.statfs		= simple_statfs,

	.destroy_inode	= securityfs_destroy_inode,

	.free_inode	= securityfs_free_inode,

};

static int fill_super(struct super_block *sb, void *data, int silent)