use for loop instead of while & init the tries and ARPING_TRIES

Co-authored-by: Jan Macku <[email protected]>

network-scripts/ifup-eth

@@ -293,7 +293,7 @@ else
 
             if ! LC_ALL=C ip addr ls ${REALDEVICE} | LC_ALL=C grep -q "${ipaddr[$idx]}/${prefix[$idx]}" ; then
                 if [ "${REALDEVICE}" != "lo" ] && ! is_false "${arpcheck[$idx]}"; then
-                    while [ "${tries}" -le "${ARPING_TRIES}" ]; do
+                    for (( tries=0; tries<${ARPING_TRIES:=1}; tries++ )); do
                         ARPING=$(/sbin/arping -c 2 -w ${ARPING_WAIT:-3} -D -I ${REALDEVICE} ${ipaddr[$idx]})
                         [ $? = 0 ] && break
                         ARPINGMAC=$(echo $ARPING |  sed -ne 's/.*\[\(.*\)\].*/\1/p')