drbd: fix connect failure with all default net-options
If no net-options are configured (all on their default), no DRBD_NLA_NET_CONF will be passed to the kernel. The kernel must not require its presence, there is no required option in there. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
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