remove unnecessary select in the beginning of acquire

Author: threadedstream

clickhouse.go

@@ -258,11 +258,6 @@ func (ch *clickhouse) acquire(ctx context.Context) (conn *connect, err error) {
 	timer := time.NewTimer(ch.opt.DialTimeout)
 	defer timer.Stop()
 	select {
-	case <-ctx.Done():
-		return nil, ctx.Err()
-	default:
-	}
-	select {
 	case <-timer.C:
 		return nil, ErrAcquireConnTimeout
 	case <-ctx.Done():