slub: Enable sysfs support for !CONFIG_SLUB_DEBUG

Currently disabling CONFIG_SLUB_DEBUG also disabled SYSFS support meaning
that the slabs cannot be tuned without DEBUG.

Make SYSFS support independent of CONFIG_SLUB_DEBUG

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index b33c0f2..e4f5ed1 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -87,7 +87,7 @@
 	unsigned long min_partial;
 	const char *name;	/* Name (only for display!) */
 	struct list_head list;	/* List of slab caches */
-#ifdef CONFIG_SLUB_DEBUG
+#ifdef CONFIG_SYSFS
 	struct kobject kobj;	/* For sysfs */
 #endif