Use for range with integers

This form is available since Go 1.22.

Signed-off-by: Kir Kolyshkin <[email protected]>

Author: kolyshkin

devices/systemd_test.go

@@ -95,7 +95,7 @@ func TestPodSkipDevicesUpdate(t *testing.T) {
 	}
 
 	// Now update the pod a few times.
-	for i := 0; i < 42; i++ {
+	for range 42 {
 		podConfig.Resources.PidsLimit++
 		podConfig.Resources.Memory += 1024 * 1024
 		if err := pm.Set(podConfig.Resources); err != nil {

file_test.go

@@ -32,7 +32,7 @@ func TestWriteCgroupFileHandlesInterrupt(t *testing.T) {
 		t.Skip(err)
 	}
 
-	for i := 0; i < 100000; i++ {
+	for i := range 100000 {
 		limit := 1024*1024 + i
 		if err := WriteFile(cgroupPath, memoryLimit, strconv.Itoa(limit)); err != nil {
 			t.Fatalf("Failed to write %d on attempt %d: %+v", limit, i, err)

fs/freezer.go

@@ -57,7 +57,7 @@ func (s *FreezerGroup) Set(path string, r *cgroups.Resources) (Err error) {
 		// Alas, this is still a game of chances, since the real fix
 		// belong to the kernel (cgroup v2 do not have this bug).
 
-		for i := 0; i < 1000; i++ {
+		for i := range 1000 {
 			if i%50 == 49 {
 				// Occasional thaw and sleep improves
 				// the chances to succeed in freezing

systemd/common.go

@@ -266,7 +266,7 @@ func systemdVersionAtoi(str string) (int, error) {
 	// Unconditionally remove the leading prefix ("v).
 	str = strings.TrimLeft(str, `"v`)
 	// Match on the first integer we can grab.
-	for i := 0; i < len(str); i++ {
+	for i := range len(str) {
 		if str[i] < '0' || str[i] > '9' {
 			// First non-digit: cut the tail.
 			str = str[:i]

systemd/systemd_test.go

@@ -90,7 +90,7 @@ func TestUnitExistsIgnored(t *testing.T) {
 	pm := newManager(t, podConfig)
 
 	// create twice to make sure "UnitExists" error is ignored.
-	for i := 0; i < 2; i++ {
+	for range 2 {
 		if err := pm.Apply(-1); err != nil {
 			t.Fatal(err)
 		}

utils.go

@@ -395,7 +395,7 @@ func WriteCgroupProc(dir string, pid int) error {
 	}
 	defer file.Close()
 
-	for i := 0; i < 5; i++ {
+	for range 5 {
 		_, err = file.WriteString(strconv.Itoa(pid))
 		if err == nil {
 			return nil