LC_ALL=C ip addr flush dev ${DEVICE} 2>&1 | grep -v "Nothing to flush"
# release slave devices
-for SLAVE_DEV in $(cat /sys/class/net/${DEVICE}/bonding/slaves); do
+for SLAVE_DEV in $(cat /sys/class/net/${DEVICE}/bonding/slaves 2>/dev/null); do
echo "-${SLAVE_DEV}" > /sys/class/net/${DEVICE}/bonding/slaves
done