etc/dists/scripts/debian-add_ip.sh: a fix for IPv6 case

In case of IPv6 address $_NETMASK can be empty, so we need to quote
arguments, otherwise their positions will be shifted and we will end
up having value of $IFNUM as $_MASK and empty $IFNUM. Bad bad bad.

Signed-off-by: Kir Kolyshkin <kir@openvz.org>
1 file changed