net: if_arp: use define instead of hard-coded value
uapi/linux/if_arp.h includes linux/netdevice.h, which uses IFNAMSIZ. Hence, use it instead of hard-coded value. Signed-off-by: NHåkon Bugge <haakon.bugge@oracle.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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