chroot: avoid unwrap-like operation

[oech3]

No description provided.

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/chroot/chroot-fail. tests/chroot/chroot-fail is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/rm/no-give-up. tests/rm/no-give-up is passing on 'main'. Maybe you have to rebase?
Skip an intermittent issue tests/tail/symlink (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/date/resolution (passes in this run but fails in the 'main' branch)
Note: The gnu test tests/chroot/chroot-credentials is now being skipped but was previously passing.
Note: The gnu test tests/cp/preserve-gid is now being skipped but was previously passing.
Note: The gnu test tests/cp/special-bits is now being skipped but was previously passing.
Note: The gnu test tests/id/setgid is now being skipped but was previously passing.
Note: The gnu test tests/mv/sticky-to-xpart is now being skipped but was previously passing.
Note: The gnu test tests/rm/fail-2eperm is now being skipped but was previously passing.
Note: The gnu test tests/touch/now-owned-by-other is now being skipped but was previously passing.
Note: The gnu test tests/truncate/truncate-owned-by-other is now being skipped but was previously passing.

[cakebaker]

I think you could add map(OsString::from) here so you have OsStrings in the Some(c) case of the match. An alternative might be to use OsString with clap.

[oech3]

I used clap. Thankyou.

[oech3]

GnuTest failed.