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Fixes a potential null pointer dereference in `esp_netif` when PPP mode is enabled. In the Ethernet event handler, `esp_netif_dhcps_start()` and `esp_netif_dhcps_stop()` are now only called if `netif` is non-null (in provisioning mode when the actual TCP/IP stack from IDF is used, in work mode the `netif` is null, since the trafic is simply forwarded between wireless and wired networks without TCP/IP stack involved) Closes https://github.com/espressif/esp-idf/issues/14816