_data_packet_verify read an uninitialised field_size for a first field
outside the packet's version, and gave later ones the size of the field
before them. No field of the game's packets has a version limit, so no
packet changes; the size starts at 0.
(from commit c01c68537bcbda79f0e4def4211cad611dfdee74's data_packets.c
change; the rest of that commit, comments rewritten, is not taken)
xshxdex98
81faf309bb