[issue7701] fix output string length for binascii.b2a_uu()

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> The patch doesn't apply cleanly against trunk

Because of r77497 (issue #770). No problem, here is the new patch. I'm now using a git-svn repository to keep all my patches. It's much easier to update them to trunk ;-)

> Also, it would be nice to add a test.

done

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Added file: http://bugs.python.org/file15879/binascii_b2a_uu_length-3.patch

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