tools/vm/page_owner_sort.c: check malloc() return

Link: https://lkml.kernel.org/r/20210506131402.10416-1-tangbin@cmss.chinamobile.com
Signed-off-by: Zhang Shengju <zhangshengju@cmss.chinamobile.com>
Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

tools/vm/page_owner_sort.c

@@ -132,6 +132,10 @@ int main(int argc, char **argv)
 	qsort(list, list_size, sizeof(list[0]), compare_txt);
 
 	list2 = malloc(sizeof(*list) * list_size);
+	if (!list2) {
+		printf("Out of memory\n");
+		exit(1);
+	}
 
 	printf("culling\n");