zero initialization in DecodeEthPkt()

["J.Hwan Kim" <frog1120 () gmail com>]

Hi, everyone

There is a zero initialization routine of Packet structure in
DecodeEthPkt().
memset(p, 0, PKT_ZERO_LEN);

Is the routine necessary?
What will happen if I remove the routine?

Thanks in advance.

Best Regards,
J.Hwan Kim

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