[Toybox] [PATCH] xxd -r: don't seek unnecessarily on the output stream.

[enh]

Also add a dup() to fix a double close() noticed in strace when looking at
the lseek() issue...

Fixes: https://github.com/landley/toybox/issues/338
---
 tests/xxd.test   | 4 ++++
 toys/other/xxd.c | 6 ++++--
 2 files changed, 8 insertions(+), 2 deletions(-)
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