mm/slub.c: fix sysfs filename in comment

/sys/kernel/slab/xx/defrag_ratio should be remote_node_defrag_ratio.

Link: http://lkml.kernel.org/r/1463449242-5366-1-git-send-email-lip@dtdream.com


Signed-off-by: Li Peng <lip@dtdream.com>
Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>