delete goroutine

sl500.go

@@ -326,14 +326,8 @@ func (s *Sl500) RfM1Transfer(blockNumber byte) ([]byte, error) {
 }
 
 func readResponseWithTimeout(s *Sl500) ([]byte, error) {
-	inner := make(chan response)
+	i, err := readResponse(s)
-
+	v := response{data: i, err: err}
-	go func() {
-		i, v := readResponse(s)
-		inner <- response{data: i, err: v}
-	}()
-
-	v := <-inner
 
 	return v.data, v.err
 }