to avoid unnecessary 64 bit ops which would make binaries larger:
satime_t (currently unsigned int):
numbers in seconds returned by the machine dependent getsecs() function
which are used to measure relative time
saseconds_t (currently int):
numbers in seconds used to specify timeout to network drivers
Per discussion on current-users.
- Make prototype of ether_sprintf() match the one in sys/net.
- Rename in_cksum to ip_cksum and fix its prototype. in_cksum() operates
on an mbuf and ip_cksum() operates on a plain buffer. We should not call
functions that operate on different arguments the same name (this is not
c++).
