fts_read: Handle error from a NULL return better.

This is addressing cases such as fts_read(3) encountering an [EIO]
from fchdir(2) when FTS_NOCHDIR is not set. That would otherwise be
seen as a successful traversal in some of these cases while silently
discarding expected work.

As noted in r264201, fts_read() does not set errno to 0 on a successful
EOF so it needs to be set before calling it. Otherwise we might see
a random error from one of the iterations.

gzip is ignoring most errors and could be improved separately.

Reviewed by: vangyzen
Sponsored by: Dell EMC
Differential Revision: https://reviews.freebsd.org/D27184

mtree -c: Fix username logic when getlogin(3) fails.

Obtained from: NetBSD (Credit to Sascha Wildner with DragonFlyBSD)
MFC after: 2 weeks

Use type-independent formats for printing nlink_t and ino_t.

Extracted from: ino64 work by gleb, mckusick
Discussed with: mckusick
Sponsored by: The FreeBSD Foundation
MFC after: 1 week