QUIC: Assert when udp_thread is 0

[scw00]

Otherwise coredump .

(gdb) down
#0  0x000000000084b52a in EventIO::start (this=0x1e5be98, l=0x0, afd=26, c=0x1e5bdb0, e=-2147483647) at /home/scw00/trafficserver/iocore/net/P_UnixNet.h:600
600	  return epoll_ctl(event_loop->epoll_fd, EPOLL_CTL_ADD, fd, &ev);
(gdb) p event_loop
$5 = (EventLoop) 0x0
(gdb) bt
#0  0x000000000084b52a in EventIO::start (this=0x1e5be98, l=0x0, afd=26, c=0x1e5bdb0, e=-2147483647) at /home/scw00/trafficserver/iocore/net/P_UnixNet.h:600
#1  0x0000000000918181 in EventIO::start (this=0x1e5be98, l=0x0, vc=0x1e5bdb0, events=-2147483647) at P_UnixNet.h:555
#2  0x000000000091688d in UDPNetProcessor::UDPBind (this=0xea0c50 <udpNetInternal>, cont=0x1ee6e70, addr=0x1ee6ee8, send_bufsize=1048576, recv_bufsize=1048576) at UnixUDPNet.cc:801
#3  0x000000000091aaf9 in QUICNetProcessor::main_accept (this=0xea0d60 <quic_NetProcessor>, cont=0x1ea5410, fd=-1, opt=...) at QUICNetProcessor.cc:217
#4  0x0000000000716871 in start_HttpProxyServer () at HttpProxyServerMain.cc:370
#5  0x00000000006cd832 in main (argv=0x7fffffffdc38) at traffic_server/traffic_server.cc:1968
(gdb) l

[github-actions]

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