[Toybox] [PATCH] arp: just use fscanf().

[enh]

Actually, the general get_line() -> getline() transformation isn't
necessary here. These are all small fixed-size buffers in the kernel, so
we can just use fscanf().
---
 toys/pending/arp.c | 19 ++++++-------------
 1 file changed, 6 insertions(+), 13 deletions(-)
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