[Toybox] [PATCH] arp: fix the scanf %s numbers.

[enh]

Just like every other time I've used %s with scanf, I was off by
one... The number _doesn't_ include the space for the NUL.

---
 toys/pending/arp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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