fix wrong break in real ip conflict

network-scripts/ifup-eth

@@ -299,7 +299,7 @@ else
                         ARPINGMAC=$(echo $ARPING |  sed -ne 's/.*\[\(.*\)\].*/\1/p')
                         if [ -n "${ARPINGMAC}" ]; then
                             net_log $"Error, some other host ($ARPINGMAC) already uses address ${ipaddr[$idx]}."
-                            break
+                            exit 1
                         fi
                         tries=$((tries+1))
                     done