tools/vm/page_owner_sort.c: delete invalid duplicate code

I noticed that there is two invalid lines of duplicate code.  It's better
to delete it.

Link: https://lkml.kernel.org/r/20211213095743.3630-1-caoyixuan2019@email.szu.edu.cnSigned-off-by: Yixuan Cao <caoyixuan2019@email.szu.edu.cn>
Cc: Mark Brown <broonie@kernel.org>
Cc: Sean Anderson <seanga2@gmail.com>
Cc: Zhenliang Wei <weizhenliang@huawei.com>
Cc: Tang Bin <tangbin@cmss.chinamobile.com>
Cc: Yinan Zhang <zhangyinan2019@email.szu.edu.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

tools/vm/page_owner_sort.c

@@ -227,8 +227,6 @@ static void add_list(char *buf, int len)
 	list[list_size].pid = get_pid(buf);
 	list[list_size].ts_nsec = get_ts_nsec(buf);
 	list[list_size].free_ts_nsec = get_free_ts_nsec(buf);
-	memcpy(list[list_size].txt, buf, len);
-	list[list_size].txt[len] = 0;
 	list_size++;
 	if (list_size % 1000 == 0) {
 		printf("loaded %d\r", list_size);