fix conn accept deadlock

pkg/listener/listener.go

@@ -8,12 +8,12 @@ import (
 	"log"
 	"net"
 	"regexp"
+	"strconv"
+	"strings"
 	"tcp-proxy/pkg/common"
 	"tcp-proxy/pkg/config"
 	"tcp-proxy/pkg/logger"
 	"tcp-proxy/pkg/proxy"
-	"strconv"
-	"strings"
 
 	"github.com/google/uuid"
 )
@@ -146,6 +146,7 @@ func accept(ctx context.Context, listener *net.TCPListener, connChan chan *net.T
 		select {
 		case <-ctx.Done():
 			return
+		default:
 		}
 	}
 }