rounddown2 tends to produce longer lines than the original code
and when the code has a high indentation level it was not really
advantageous to do the replacement.
This tries to strike a balance between readability using the macros
and flexibility of having the expressions, so not everything is
converted.
to double check for if the card has probed before. In fact, there's no
reason to single check either. Simplify the code as a result.
$FreeBSD$ added to lxutil.c in a non-standard way to help keep the
diffs with upstream to a minimum.
Differential Revision: https://reviews.freebsd.org/D3263
