p2p/discover: remove unused function

p2p/discover/table_util_test.go

@@ -17,7 +17,6 @@
 package discover
 
 import (
-	"crypto/ecdsa"
 	"encoding/hex"
 	"fmt"
 	"math/rand"
@@ -167,11 +166,3 @@ func hexEncPubkey(h string) (ret encPubkey) {
 	copy(ret[:], b)
 	return ret
 }
-
-func hexPubkey(h string) *ecdsa.PublicKey {
-	k, err := decodePubkey(hexEncPubkey(h))
-	if err != nil {
-		panic(err)
-	}
-	return k
-}