Use a heap allocated string to set arg_ifname, since a stack allocated
one would be lost after the function returns. (This last one broke the
case where an interface name was suffixed with a dot, such as in
`resolvconf -a tap0.dhcp`.)
Signed-off-by: Andrej Valek <andrej.valek@siemens.com> Signed-off-by: Simon Ausserlechner <simon.ausserlechner@siemens.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
