dabbad: fix sizeof() during malloc operation.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>
rpc: add error code in 'interface status' rpc msg.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>
dabbad: return error code on 'interface modify status' rpc.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>