[Toybox] [PATCH] echo: fix trailing \0.

[enh]

This is a follow-on from 310eefe, addressing the case where sscanf fails
and returns -1.
---
 lib/lib.c       | 2 +-
 tests/echo.test | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)
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