network/netroot.sh: do not unset root

modules.d/40network/netroot.sh

@@ -24,9 +24,6 @@ netif=$1
 # handlers when this is not called from manually network bringing up.
 if [ -z "$2" ]; then
     if [ "$netroot" = "dhcp" ] || [ "$netroot" = "dhcp6" ] ; then
-        # Unset root so we can check later
-        unset root
-
         # Load dhcp options
         [ -e /tmp/dhclient.$netif.dhcpopts ] && . /tmp/dhclient.$netif.dhcpopts