#162 EQ2Packet::PreparePacket returns -1 is not listed in the opcodes table for opcode but still desyncs client

Any preparepacket attempt even when returning -1 with bad match for opcode causes client to crash, desync (encryption seems to be a lost cause at that point).

Fixed by LE via http://cutpon.com:3000/devn00b/EQ2EMu/commit/74bd3c5a52991f20ec3419319d893b30553a8630 additionally: http://cutpon.com:3000/devn00b/EQ2EMu/commit/dbc325fb6ac34ce8faa0e336364918bcd6fe8d6e http://cutpon.com:3000/devn00b/EQ2EMu/commit/f31af3dd0db9ab1ffd7f329340d7289fb29cd3bb