Fix error in realtime-preempt patch for mm/slob.c

This error was caused by a change to slob_free()'s interface.

Signed-off-by: Peter Williams <pwil3058@bigpond.net.au>

diff -r cb0010b7bffe mm/slob.c
--- a/mm/slob.c	Fri Jul 13 15:24:45 2007 +1000
+++ b/mm/slob.c	Fri Jul 13 16:23:02 2007 +1000
@@ -493,14 +493,14 @@ void *kmem_cache_zalloc(struct kmem_cach
 }
 EXPORT_SYMBOL(kmem_cache_zalloc);
 
-static void __kmem_cache_free(void *b, int size)
+static void __kmem_cache_free(struct kmem_cache *c, void *b)
 {
 	atomic_dec(&c->items);
 
 	if (c->size <= MAX_SLOB_CACHE_SIZE)
 		slob_free(c, b, c->size);
 	else
-		free_pages((unsigned long)b, get_order(size));
+		free_pages((unsigned long)b, get_order(c->size));
 }
 
 static void kmem_rcu_free(struct rcu_head *head)
@@ -508,7 +508,7 @@ static void kmem_rcu_free(struct rcu_hea
 	struct slob_rcu *slob_rcu = (struct slob_rcu *)head;
 	void *b = (void *)slob_rcu - (slob_rcu->size - sizeof(struct slob_rcu));
 
-	__kmem_cache_free(b, slob_rcu->size);
+	__kmem_cache_free(slob_rcu, b);
 }
 
 void kmem_cache_free(struct kmem_cache *c, void *b)
@@ -520,7 +520,7 @@ void kmem_cache_free(struct kmem_cache *
 		slob_rcu->size = c->size;
 		call_rcu(&slob_rcu->head, kmem_rcu_free);
 	} else {
-		__kmem_cache_free(b, c->size);
+		__kmem_cache_free(c, b);
 	}
 }
 EXPORT_SYMBOL(kmem_cache_free);