MFC r318211:

MFC r318211:

Fix up previous commit

- Apply the logic to the FreeBSD block
- Fix a typo with the getconf(1) call that I would have caught, were
  it not for the fact that I got the blocks wrong.
- Consolidate the hardcoded buffer sizes to the NetBSD block.

This would have been discovered had I run the test on a system where
PATH_MAX != 1024 (I don't have that at my disposal right at this moment).

MFC with:	r318210

git-svn-id: svn://svn.freebsd.org/base/stable/10@319484 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f