system/ping: Fix a segmentation fault when using ping

[acassis]

Summary

nsh> ping google.com
[ 37.180000] dns_query_error: ERROR: IPv4 dns_recv_response fa: -84,
server address: 8.8.8.8
Segmentation fault.

Impact

BUG Fix!

Testing

$ sudo ./nuttx 
[sudo] password for alan: 

NuttShell (NSH) NuttX-13.0.0-RC2
nsh> ifup eth0
ifup eth0...OK
nsh> ping google.com
PING 172.217.29.78 56 bytes of data
56 bytes from 172.217.29.78: icmp_seq=0 time=20.0 ms
56 bytes from 172.217.29.78: icmp_seq=1 time=20.0 ms
56 bytes from 172.217.29.78: icmp_seq=2 time=20.0 ms
56 bytes from 172.217.29.78: icmp_seq=3 time=20.0 ms
56 bytes from 172.217.29.78: icmp_seq=4 time=20.0 ms
56 bytes from 172.217.29.78: icmp_seq=5 time=20.0 ms
56 bytes from 172.217.29.78: icmp_seq=6 time=20.0 ms
56 bytes from 172.217.29.78: icmp_seq=7 time=20.0 ms
56 bytes from 172.217.29.78: icmp_seq=8 time=20.0 ms
56 bytes from 172.217.29.78: icmp_seq=9 time=20.0 ms
10 packets transmitted, 10 received, 0% packet loss, time 10100 ms
rtt min/avg/max/mdev = 20.000/20.000/20.000/0.000 ms
nsh> 

[cederom]

Wow, good catch, thank you @acassis :-)

[acassis]

Wow, good catch, thank you @acassis :-)

I got some help:
https://claude.ai/share/321e19f6-cd11-4f44-b0b6-eac5e278f86f

[cederom]

Hmm, how much does it cost? I have some js application to fix and do not want to waste more time maybe its a good task for that AI stuff? :D