Follow-up for PR #34909. This fixes an issue that network interfaces cannot join a master netdev, like bond or bridge, when the corresponding .netdev is reloaded. With PR #34909, networkd supports reloading .netdev files. However, When a .netdev file is modified and reloaded, ifindex is copied from the old NetDev object to the new one. Thus, even if the interface is successfully updated, netdev_set_ifindex_impl() will return 0 and netdev_enter_ready() will never called. If the netdev is a kind of master netdev, then port interfaces cannot join the master netdev, as REQUEST_TYPE_SET_LINK_MASTER requires that the master netdev is in the ready state.
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