fts: address post-merge feedback on fts_set_test.c

Per review by des@:

- Remove fts_check_debug() which has no effect in fts_set_test.c, and
remove unused #include "fts_test.h"
- Add errno = 0 be

fts: address post-merge feedback on fts_set_test.c

Per review by des@:

- Remove fts_check_debug() which has no effect in fts_set_test.c, and
remove unused #include "fts_test.h"
- Add errno = 0 before fts_read() so errno check is meaningful
- Remove fts_lexical_compar where traversal order does not matter
- Change int boolean flags to bool throughout
- Use !saw_inside instead of saw_inside == false
- Move fts_set_clientptr/fts_get_clientptr test inside fts_read()
loop so the pointer is exercised during active traversal

Fixes: 940142d6103 ("lib/libc/tests/gen: add fts_set() tests")
Sponsored by: Google LLC (GSoC 2026)
Reviewed by: des, asomers
MFC after: 2 weeks
Pull Request: https://github.com/freebsd/freebsd-src/pull/2258

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lib/libc/tests/gen: add fts_set() tests

Add ATF test cases for fts_set():

fts_set:
- invalid instruction returns non-zero with EINVAL
- FTS_AGAIN revisits the current node
- FTS_AGAIN consecutive v

lib/libc/tests/gen: add fts_set() tests

Add ATF test cases for fts_set():

fts_set:
- invalid instruction returns non-zero with EINVAL
- FTS_AGAIN revisits the current node
- FTS_AGAIN consecutive visits node three times
- FTS_FOLLOW on symlink to file yields FTS_F
- FTS_FOLLOW on symlink to directory causes descent
- FTS_FOLLOW on dead symlink yields FTS_SLNONE
- FTS_SKIP prevents descent into directory
- fts_set_clientptr/fts_get_clientptr round-trip
- fts_get_stream returns parent FTS* from FTSENT*

Sponsored by: Google LLC (GSoC 2026)
Reviewed by: asomers
MFC after: 2 weeks
Pull Request: https://github.com/freebsd/freebsd-src/pull/2242

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