tools/sched_ext: scx_flatcg: zero-initialize stats counter array

The local cnts array in read_stats() is not initialized before being
accumulated into per-CPU stats, which may lead to reading garbage
values. Zero it out with memset alongside the existing stats array
initialization.

Signed-off-by: David Carlier <devnexen@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

Author: devnexen

tools/sched_ext/scx_flatcg.c

@@ -106,6 +106,7 @@ static void fcg_read_stats(struct scx_flatcg *skel, __u64 *stats)
 	__u32 idx;
 
 	memset(stats, 0, sizeof(stats[0]) * FCG_NR_STATS);
+	memset(cnts, 0, sizeof(cnts));
 
 	for (idx = 0; idx < FCG_NR_STATS; idx++) {
 		int ret, cpu;