Several trivial fixes

bencode/decode.go

@@ -490,7 +490,6 @@ func (d *decoder) parse_value_interface() (interface{}, bool) {
 			What:   errors.New("unknown value type (invalid bencode?)"),
 		})
 	}
-	panic("unreachable")
 }
 
 func (d *decoder) parse_int_interface() interface{} {

client.go

@@ -1064,7 +1064,7 @@ func (cl *Client) receiveHandshakes(c *connection) (t *torrent, err error) {
 	}
 	ih, ok, err := cl.connBTHandshake(c, nil)
 	if err != nil {
-		fmt.Errorf("error during bt handshake: %s", err)
+		err = fmt.Errorf("error during bt handshake: %s", err)
 		return
 	}
 	if !ok {

dht/dht.go

@@ -596,7 +596,7 @@ func (s *Server) processPacket(b []byte, addr dHTAddr) {
 					return
 				}
 			}
-			log.Printf("%s: received bad krpc message from %s: %s: %q", s, addr, err, b)
+			log.Printf("%s: received bad krpc message from %s: %s: %+q", s, addr, err, b)
 		}()
 		return
 	}