[wifi] Clear wifi_bss -> wifi_network pointers on delete. JB#47990
When WiFi is being turned off, wifi_network is getting deallocated before wifi_bss, causing crashes like this one: Invalid read of size 4 at 0x3496E: wifi_network_update_strength (sailfish_wifi.c:1626) by 0x36A8D: wifi_device_bss_signal_changed (sailfish_wifi.c:2908) by 0x4CB06E7: _g_closure_invoke_va (gclosure.c) by 0x4CC3EF7: g_signal_emit_valist (gsignal.c) by 0x4CC42EB: g_signal_emit (gsignal.c) by 0x4B591F1: gsupplicant_bss_signal_property_change (gsupplicant_bss.c) ... Address 0x68b0038 is 8 bytes inside a block of size 100 free'd at 0x48432B0: free (vg_replace_malloc.c) by 0x34D75: wifi_network_delete (sailfish_wifi.c:1763) by 0x35321: wifi_device_delete_network (sailfish_wifi.c:2009) by 0x3538D: wifi_device_remove_all_networks_cb (sailfish_wifi.c:2036) by 0x4D434B3: g_slist_foreach (gslist.c) by 0x353BB: wifi_device_remove_all_networks (sailfish_wifi.c:2042) by 0x3895B: wifi_device_set_state (sailfish_wifi.c:3952) by 0x387D3: wifi_device_disable (sailfish_wifi.c:3883) by 0x39263: wifi_device_driver_disable (sailfish_wifi.c:4307) by 0x512AF: __connman_device_disable (device.c:265) by 0x8B3AB: technology_affect_devices (technology.c:742) by 0x8B835: technology_disable (technology.c:901) by 0x8BABF: set_powered (technology.c:1017) by 0x8BFA7: set_property (technology.c:1165) ...
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