ping: Simplify protocol selection.

[des]

Summary

• Interrupt the option loop as soon as we have an indication of which protocol is intended.
• If we end up having to perform a DNS lookup, loop over the entire result looking for either IPv4 or IPv6 addresses.

Sponsored by: NetApp, Inc.
Sponsored by: Klara, Inc.

[des]

fall through

[allanjude]

reviewed-by: allanjude

[des]

sbin/ping/main.c

145–146

I can't make up my mind about this... if getaddrinfo() didn't return anything useful, that's not likely to change. Should I put the errx(1, "Unknown host") back? (above the #endif though)

[des]

don't fall through