LibDNS: Use AllocatingMemoryStream in DNS package construction

Author: https://github.com/timschumi
Commit: 87c64834ca
Pull-request: https://github.com/SerenityOS/serenity/pull/16992
Reviewed-by: https://github.com/ADKaster ✅

Userland/Services/LookupServer/MulticastDNS.cpp

@@ -110,7 +110,7 @@ void MulticastDNS::announce()
 
 ErrorOr<size_t> MulticastDNS::emit_packet(Packet const& packet, sockaddr_in const* destination)
 {
-    auto buffer = packet.to_byte_buffer();
+    auto buffer = TRY(packet.to_byte_buffer());
     if (!destination)
         destination = &mdns_addr;