examples: print hwaddr attribute if present

There was a bug in 5.15 where HWADDR was included even if mac_header
start was same as network header.

In that case, userspace would get network header re-interpreted as a
mac address, i.e. hw->hw_addr[] set to network_header + 6 in ethernet
case.

Dump hwaddr if present.

Signed-off-by: Florian Westphal <fw@strlen.de>

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