Close server hbConn on err

Since all err on c.stream Read represents some issue with the underlying conn, it should be safe to close the connection upon receiving an error.

pkg/dtls/heartbeat.go

@@ -3,8 +3,6 @@ package dtls
 import (
 	"bytes"
 	"errors"
-	"io"
-	"net"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -84,13 +82,8 @@ func (c *hbConn) recvLoop() {
 		}
 
 		if err != nil {
-			c.recvCh <- errBytes{nil, err}
-			switch {
-			case errors.Is(err, net.ErrClosed):
-			case errors.Is(err, io.EOF):
-				c.Close()
-				return
-			}
+			c.Close()
+			return
 		}
 
 		c.recvCh <- errBytes{buffer[:n], err}