[patch #6851] fix a bug in BPF

[Zheng Da]

Follow-up Comment #2, patch #6851 (project hurd):

The packet delivered from gnumach should have the packet header. NPF returns
the packet_header and pfinet always assumes that the packet from gnumach has
the packet_header.

For your first question, the return value of net_do_filter is boolean, i.e.,
it can only be passed or not passed, but bpf_do_filter returns the size of the
data that passes the filter.

bpf_do_filter(infp, net_kmsg(kmsg)->packet + sizeof(struct packet_header),
count, net_kmsg(kmsg)->header, ifp->if_header_size, &hash_headp, &entp) is
simply wrong because the length of the packet data passed to bpf_do_filter
isn't 'count' any more.

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