bintrans: Error out if writing to the output failed.

- Cover all code paths.
- When decoding, check all output files, not just the last one.
- A simple `ferror()` check is not enough as an error may

bintrans: Error out if writing to the output failed.

- Cover all code paths.
- When decoding, check all output files, not just the last one.
- A simple `ferror()` check is not enough as an error may later occur
while flushing whatever remains in the output buffer.

MFC after: 1 week
Sponsored by: Klara, Inc.
Reviewed by: allanjude
Differential Revision: https://reviews.freebsd.org/D43532

(cherry picked from commit 5cb28f7979773715615cc2131fe40e0c5879ed1d)

bintrans: Fix uninitialized variable.

`prev` may be used uninitialized if `body` starts with a newline.

MFC after: 1 week
Sponsored by: Klara, Inc.
Reviewed by: bapt, emaste
Differential Revision: https://reviews.freebsd.org/D43534

(cherry picked from commit bce34cba07bcfed9cd519a658e594c9910c8f210)

bintrans: Add base64 to name list in manual page.

MFC after: 1 week
Sponsored by: Klara, Inc.
Reviewed by: 0mp, pstef
Differential Revision: https://reviews.freebsd.org/D43558

(cherry picked from commit 64028ac3ba9668cff31bfe2c79d85a3b89e10953)

bintrans: Remove unused variable.

MFC after: 1 week
Sponsored by: Klara, Inc.
Reviewed by: allanjude
Differential Revision: https://reviews.freebsd.org/D43559

(cherry picked from commit bc2913d1736c2b299a265741a779014d001bd108)

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