remove dnstest changes

Signed-off-by: Miek Gieben <miek@miek.nl>

plugin/pkg/dnstest/recorder.go

@@ -2,7 +2,6 @@
 package dnstest
 
 import (
-	"runtime"
 	"time"
 
 	"github.com/miekg/dns"
@@ -20,10 +19,6 @@ type Recorder struct {
 	Len   int
 	Msg   *dns.Msg
 	Start time.Time
-	// CallerN holds string return value of the call to runtime.Caller(N)
-	Caller1 string
-	Caller2 string
-	Caller3 string
 }
 
 // NewRecorder makes and returns a new Recorder,
@@ -41,9 +36,6 @@ func NewRecorder(w dns.ResponseWriter) *Recorder {
 // WriteMsg records the status code and calls the
 // underlying ResponseWriter's WriteMsg method.
 func (r *Recorder) WriteMsg(res *dns.Msg) error {
-	_, r.Caller1, _, _ = runtime.Caller(1)
-	_, r.Caller2, _, _ = runtime.Caller(2)
-	_, r.Caller3, _, _ = runtime.Caller(3)
 	// We may get called multiple times (axfr for instance).
 	// Save the last message, but add the sizes.
 	r.Len += res.Len()