message: Fix GROUP_JOIN_FAIL being initialized as a GROUP_INVITE_FAIL.
  This was a vulnerability, since JOIN_FAIL is larger than INVITE_FAIL.
diff: @@ -95,7 +95,7 @@ void GroupManager::joinGroup(CNSocket* sock, CNPacketData* data) {
  // fail if the group is full the other player is already in a group
  if (plr->groupCnt > 1 || plr->iIDGroup != plr->iID || otherPlr->groupCnt >= 4) {
  - INITSTRUCT(sP_FE2CL_PC_GROUP_INVITE_FAIL, resp);
  + INITSTRUCT(sP_FE2CL_PC_GROUP_JOIN_FAIL, resp);
  sock->sendPacket((void*)&resp, P_FE2CL_PC_GROUP_JOIN_FAIL, sizeof(sP_FE2CL_PC_GROUP_JOIN_FAIL));
  return;
  }
  