Fixes getfields()

The main for loop steps through rune (characters).  I don't know what
the intent of 'next' was, but since the loop already managed the
character/rune length, 'next' could only offset us farther into the
rune.
Fixes MAC and arp printing

Can now cat /net/arp.  The spacing is still off for the %I, but at least
we can see the info.