[Toybox] [PATCH] Fix the potential fd leak in file(1).

[enh]

This avoids duplicating the xputs call, which I assume was the sticking
point with my previous suggestion.

Also remove the now-duplicated command name in the tests, and add a couple
more tests.
---
 tests/file.test     | 23 ++++++++++++++++-------
 toys/pending/file.c | 10 +++++-----
 2 files changed, 21 insertions(+), 12 deletions(-)
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