all: use Go 1.22 range-over-int

Updates #11058

Change-Id: I35e7ef9b90e83cac04ca93fd964ad00ed5b48430
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

util/topk/topk.go

@@ -145,7 +145,7 @@ func PickParams(err, probability float64) (hashes, buckets int) {
 }
 
 func (cms *CountMinSketch) init(hashes, buckets int) {
-	for i := 0; i < hashes; i++ {
+	for range hashes {
 		cms.hashes = append(cms.hashes, maphash.MakeSeed())
 	}
 

util/topk/topk_test.go

@@ -49,7 +49,7 @@ func TestTopK(t *testing.T) {
 		}, 4, 1000)
 
 		// Add the first 10 integers with counts equal to 2x their value
-		for i := 0; i < 10; i++ {
+		for i := range 10 {
 			topk.AddN(i, uint64(i*2))
 		}
 
@@ -82,7 +82,7 @@ func BenchmarkCountMinSketch(b *testing.B) {
 	b.ReportAllocs()
 
 	var enc [8]byte
-	for i := 0; i < b.N; i++ {
+	for i := range b.N {
 		binary.LittleEndian.PutUint64(enc[:], uint64(i))
 		cms.Add(enc[:])
 	}
@@ -104,7 +104,7 @@ func BenchmarkTopK(b *testing.B) {
 			b.ResetTimer()
 			b.ReportAllocs()
 
-			for i := 0; i < b.N; i++ {
+			for i := range b.N {
 				topk.Add(i)
 			}
 			out = topk.AppendTop(out[:0]) // should not allocate