mm/memcg: fix obsolete function name in mem_cgroup_protection()

Commit 45c7f7e1 ("mm, memcg: decouple e{low,min} state mutations from
protection checks") changed the function name but not the corresponding
comment.

Link: https://lkml.kernel.org/r/20230727115934.657787-1-linmiaohe@huawei.comSigned-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/memcontrol.h

@@ -582,7 +582,7 @@ static inline void mem_cgroup_protection(struct mem_cgroup *root,
 	/*
 	 * There is no reclaim protection applied to a targeted reclaim.
 	 * We are special casing this specific case here because
-	 * mem_cgroup_protected calculation is not robust enough to keep
+	 * mem_cgroup_calculate_protection is not robust enough to keep
 	 * the protection invariant for calculated effective values for
 	 * parallel reclaimers with different reclaim target. This is
 	 * especially a problem for tail memcgs (as they have pages on LRU)