Need a real fix to incorrect write error codes

rjmcmahon@rpi5-34:/usr/local/src/iperf2-code $ iperf -c 10.19.85.66 -i 1 -e  -w 4M
------------------------------------------------------------
Client connecting to 10.19.85.66, TCP port 5001 with pid 70749 (1/0 flows/load)
Write buffer size: 131072 Byte
TCP congestion control using cubic
TOS defaults to 0x0 (dscp=0,ecn=0) (Nagle on)
TCP window size: 8.00 MByte (WARNING: requested 4.00 MByte)
------------------------------------------------------------
[  1] local 10.19.85.56%eth1 port 35730 connected with 10.19.85.66 port 5001 (icwnd/mss/irtt=14/1448/276) (ct=0.31 ms) on 2025-03-13 14:17:12.595 (PDT)
[ ID] Interval        Transfer    Bandwidth       Write/Err  Rtry     InF(pkts)/Cwnd(pkts)/RTT(var)        NetPwr
[  1] 0.00-1.00 sec   238 MBytes  2.00 Gbits/sec  1906/0         0      475K(336)/719K(509)/2047(22) us  121980
[  1] 1.00-2.00 sec   232 MBytes  1.95 Gbits/sec  1859/0        10      431K(305)/562K(398)/1830(43) us  133149
Program error: invalid client packet->err_readwrite 0
[  1] 2.00-3.00 sec   232 MBytes  1.95 Gbits/sec  1858/0         8      412K(292)/499K(353)/1801(54) us  135220
[  1] 3.00-4.00 sec   232 MBytes  1.95 Gbits/sec  1860/0         0      393K(278)/514K(364)/1890(14) us  128991
[  1] 4.00-5.00 sec   230 MBytes  1.93 Gbits/sec  1840/0         0      417K(295)/530K(375)/1796(19) us  134283
[  1] 5.00-6.00 sec   233 MBytes  1.95 Gbits/sec  1863/0         8      381K(270)/501K(355)/1789(34) us  136494