[openwrt/openwrt] wifi-scripts: ucode: fix wpa_supplicant mesh

[LEDE Commits]

nick pushed a commit to openwrt/openwrt.git, branch openwrt-25.12:
https://git.openwrt.org/2acfd9f8ab12e4f353a0aa644d9adf89588b1f0f

commit 2acfd9f8ab12e4f353a0aa644d9adf89588b1f0f
Author: Nick Hainke <vincent at systemli.org>
AuthorDate: Thu Dec 25 20:32:28 2025 +0100

    wifi-scripts: ucode: fix wpa_supplicant mesh
    
    Mesh interfaces may not define an encryption setting. This results in
    a ucode runtime error when parse_encryption() is called:
      Reference error: left-hand side expression is null
      In parse_encryption(), file /usr/share/ucode/wifi/iface.uc, line 20, byte 32:
        called from function setup_sta (/usr/share/ucode/wifi/supplicant.uc:59:31)
        called from function generate (/usr/share/ucode/wifi/supplicant.uc:243:41)
        called from function setup (./mac80211.sh:254:61)
        called from anonymous function (./mac80211.sh:342:14)
       `    config.auth_type = encryption[0] ?? 'none';`
        Near here ------------------------^
    
    Link: https://github.com/openwrt/openwrt/pull/21293
    (cherry picked from commit 00e6c18a930df22e2734c3bc5d9b1cca1e538e6b)
    Link: https://github.com/openwrt/openwrt/pull/21295
    Signed-off-by: Nick Hainke <vincent at systemli.org>
---
 .../config/wifi-scripts/files-ucode/usr/share/ucode/wifi/iface.uc      | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/package/network/config/wifi-scripts/files-ucode/usr/share/ucode/wifi/iface.uc b/package/network/config/wifi-scripts/files-ucode/usr/share/ucode/wifi/iface.uc
index dae22abd9d..942fef059a 100644
--- a/package/network/config/wifi-scripts/files-ucode/usr/share/ucode/wifi/iface.uc
+++ b/package/network/config/wifi-scripts/files-ucode/usr/share/ucode/wifi/iface.uc
@@ -4,6 +4,9 @@ import { append_value, log } from 'wifi.common';
 import * as fs from 'fs';
 
 export function parse_encryption(config, dev_config) {
+	if (!config.encryption)
+		return;
+
 	let encryption = split(config.encryption, '+', 2);
 
 	config.wpa = 0;