mm/slub: remove unused parameter in next_freelist_entry()

The parameter "struct slab *slab" is unused in next_freelist_entry(),
so just remove it.

Acked-by: Christoph Lameter (Ampere) <cl@linux.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
(cherry picked from commit c63349f)

Author: Chengming Zhou

mm/slub.c

@@ -2038,7 +2038,7 @@ static void __init init_freelist_randomization(void)
 }
 
 /* Get the next entry on the pre-computed freelist randomized */
-static void *next_freelist_entry(struct kmem_cache *s, struct slab *slab,
+static void *next_freelist_entry(struct kmem_cache *s,
 				unsigned long *pos, void *start,
 				unsigned long page_limit,
 				unsigned long freelist_count)
@@ -2077,13 +2077,12 @@ static bool shuffle_freelist(struct kmem_cache *s, struct slab *slab)
 	start = fixup_red_left(s, slab_address(slab));
 
 	/* First entry is used as the base of the freelist */
-	cur = next_freelist_entry(s, slab, &pos, start, page_limit,
-				freelist_count);
+	cur = next_freelist_entry(s, &pos, start, page_limit, freelist_count);
 	cur = setup_object(s, cur);
 	slab->freelist = cur;
 
 	for (idx = 1; idx < slab->objects; idx++) {
-		next = next_freelist_entry(s, slab, &pos, start, page_limit,
+		next = next_freelist_entry(s, &pos, start, page_limit,
 			freelist_count);
 		next = setup_object(s, next);
 		set_freepointer(s, cur, next);