cmd: apply go fix

Updates #cleanup

Signed-off-by: Adriano Sela Aviles <adriano@tailscale.com>

cmd/k8s-operator/sts_test.go

@@ -41,10 +41,7 @@ func Test_statefulSetNameBase(t *testing.T) {
 		if _, err := b.WriteString("a"); err != nil {
 			t.Fatalf("error writing to string builder: %v", err)
 		}
-		baseLength := b.Len()
-		if baseLength > 43 {
-			baseLength = 43 // currently 43 is the max base length
-		}
+		baseLength := min(b.Len(), 43)                                              // currently 43 is the max base length
 		wantsNameR := regexp.MustCompile(`^ts-a{` + fmt.Sprint(baseLength) + `}-$`) // to match a string like ts-aaaa-
 		gotName := statefulSetNameBase(b.String())
 		if !wantsNameR.MatchString(gotName) {