fix some linter warnings

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2016-today José Nieto, https://menteslibres.net/xiam
+Copyright (c) 2016-today José Nieto, https://xiam.io
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

arp/arp_linux.go

@@ -8,20 +8,20 @@ import (
 	"net"
 	"os/exec"
 	"regexp"
-	"strconv"
 )
 
 var lineMatch = regexp.MustCompile(`([0-9\.]+)\s+dev\s+([^\s]+)\s+lladdr\s+([0-9a-f:]+)`)
 
-func hexToInt(h string) uint8 {
-	v, _ := strconv.ParseInt(h, 16, 16)
-	return uint8(v)
-}
-
 func doARPLookup(ip string) (*Address, error) {
+
 	ping := exec.Command("ping", "-c1", "-t1", ip)
-	ping.Run() // TODO: manually inject arp who has packet.
-	ping.Wait()
+	if err := ping.Run(); err != nil { // TODO: manually inject arp who has packet.
+		return nil, err
+	}
+
+	if err := ping.Wait(); err != nil {
+		return nil, err
+	}
 
 	cmd := exec.Command("ip", "n", "show", ip)
 	out, err := cmd.Output()

arp/arp_test.go

@@ -2,7 +2,6 @@ package arp
 
 import (
 	"encoding/binary"
-	"fmt"
 	"net"
 	"testing"
 )

main.go

@@ -1,4 +1,4 @@
-// Copyright (c) 2016 José Nieto, https://menteslibres.net/malfunkt
+// Copyright (c) 2016-present José Nieto, https://xiam.io
 //
 // Permission is hereby granted, free of charge, to any person obtaining
 // a copy of this software and associated documentation files (the
@@ -165,13 +165,9 @@ func main() {
 	c := make(chan os.Signal)
 	signal.Notify(c, os.Interrupt)
 	go func() {
-		for {
-			select {
-			case <-c:
-				log.Println("'stop' signal received; stopping...")
-				close(stop)
-				return
-			}
+		for range c {
+			log.Println("'stop' signal received; stopping...")
+			close(stop)
 		}
 	}()