slirp: Remove unused zero_ethaddr[] variable

The zero_ethaddr[] array is never used; delete it.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

slirp/slirp.c

@@ -37,8 +37,6 @@ static const uint8_t special_ethaddr[ETH_ALEN] = {
     0x52, 0x55, 0x00, 0x00, 0x00, 0x00
 };
 
-static const uint8_t zero_ethaddr[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 };
-
 u_int curtime;
 
 static QTAILQ_HEAD(slirp_instances, Slirp) slirp_instances =