Only check that the offset < sizeof(struct ip) if nxt != 0, i.e. in the
tcp and udp cases. From kre.
XXX: pullup 7
lua(4): fixed Lua stack size
lua(4): included <sys/param.h> into sys/lua.h
lua(4): fixed require
hardware cursor support
hide the hw cursor when blanking the screen
make the full amount of reserved video memory available to userland