This was being included implicitly via cgroup.h's inclusion of xattr.h
(which has now been removed).
Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au>
Acked-by: NSam Ravnborg <sam@ravnborg.org>
Signed-off-by: NTejun Heo <tj@kernel.org>