memcontrol: use flexible-array member

Change deprecated zero-length-and-one-element-arrays into flexible array
member.Zero-length and one-element arrays detected by Lukas's CodeChecker.
Zero/one element arrays cause undefined behaviours if sizeof() used.

Link: https://lkml.kernel.org/r/20210518200910.29912-1-wenhui@gwmail.gwu.eduSigned-off-by: wenhuizhang <wenhui@gwmail.gwu.edu>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Roman Gushchin <guro@fb.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Alex Shi <alexs@kernel.org>
Cc: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Cc: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/memcontrol.h

@@ -349,8 +349,7 @@ struct mem_cgroup {
 	struct deferred_split deferred_split_queue;
 #endif
 
-	struct mem_cgroup_per_node *nodeinfo[0];
-	/* WARNING: nodeinfo must be the last member here */
+	struct mem_cgroup_per_node *nodeinfo[];
 };
 
 /*