[Toybox] [PATCH] Fix FAILCOUNT arithmetic for mksh.

[enh]

ping... (FAILCOUNT doesn't work on Android without this.)

On Sat, Jun 22, 2019 at 9:34 AM enh <enh at google.com> wrote:

> mksh doesn't support $[], only $(()).
> ---
>  scripts/runtest.sh | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
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