Sysfn 74 returns -1 for a missing device, not 0, so the device-presence
check in .maintain_link never took the .link_down path and the interface
stayed in connected state forever. As a result DHCP was never restarted
when a device reappeared on the same slot (e.g. an Android phone
re-enumerating in RNDIS tethering mode with a new random MAC), leaving
the interface with a stale IP and a dead gateway.
Compare against 1 (Ethernet), the same way the .link_up? path already
does, so a vanished device properly resets the interface state and DHCP
runs again on reconnect.
Assisted-by: Claude Opus 5 <noreply@anthropic.com>
Reviewed-on: KolibriOS/kolibrios#676
Reviewed-by: hidnplayr <hidnplayr@gmail.com>
Reviewed-by: Burer <burer@kolibrios.org>
Co-authored-by: leency <lipatov.kiril@gmail.com>
Leency
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