Synchronise with FreeBSD:

Synchronise with FreeBSD:

make printlink()'s FTSENT parameter const, it doesn't get modified at all
during the function call, reflect that.

Use the unit_t typedef for the unitp array.

Use u_int for unit_sz as other unsigned integers do.

Cast ilogb()'s return value to u_int to match unit_sz (ilogb() returns an int).

Cast UNIT_MAX to u_int because enum types are int.