build_icmp_raw and friends ignoring data

[David Fifield <david () bamsoftware com>]

I found that build_icmp_raw, build_igmp_raw, and possibly others are not
filling in the payload data that they are being called with. Instead,
they are reserving the requested number of bytes but filling them with
zeroes. The upper layer feeds in random bytes from --data-length.

David Fifield
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