Fix undefined count_partial if !CONFIG_SLABINFO

Small typo in the patch recently merged to avoid the unused symbol
message for count_partial(). Discussion thread with confirmation of fix at
http://marc.info/?t=120696854400001&r=1&w=2

Typo in the check if we need the count_partial function that was
introduced by 53625b42Signed-off-by: NChristoph Lameter <clameter@sgi.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

mm/slub.c

@@ -2688,7 +2688,7 @@ void kfree(const void *x)
 }
 EXPORT_SYMBOL(kfree);
 
-#if defined(SLUB_DEBUG) || defined(CONFIG_SLABINFO)
+#if defined(CONFIG_SLUB_DEBUG) || defined(CONFIG_SLABINFO)
 static unsigned long count_partial(struct kmem_cache_node *n)
 {
 	unsigned long flags;