chore: linter: errorlint

Signed-off-by: Jakob Borg <jakob@kastelo.net>

lib/beacon/broadcast.go

@@ -8,6 +8,7 @@ package beacon
 
 import (
 	"context"
+	"errors"
 	"log/slog"
 	"net"
 	"time"
@@ -93,7 +94,8 @@ func writeBroadcasts(ctx context.Context, inbox <-chan []byte, port int) error {
 			_, err = conn.WriteTo(bs, dst)
 			conn.SetWriteDeadline(time.Time{})
 
-			if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
+			var nerr net.Error
+			if errors.As(err, &nerr) && nerr.Timeout() {
 				// Write timeouts should not happen. We treat it as a fatal
 				// error on the socket.
 				l.Debugln(err)