[openwrt/openwrt] wifi-scripts: ucode: fix init value of config.ht_capab under 20MHz

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/7ea377ed715078c9559891d69a455e0796be4eed

commit 7ea377ed715078c9559891d69a455e0796be4eed
Author: Zhi-Jun You <hujy652 at protonmail.com>
AuthorDate: Thu Nov 13 18:00:17 2025 +0800

    wifi-scripts: ucode: fix init value of config.ht_capab under 20MHz
    
    Currently the path for setting 20MHz doesn't set ht_capab to '' at the
    beginning which results in null in ht_capab in hostapd.conf.
    
    Fix this by setting config.ht_capab to '' for 20MHz htmode.
    
    Fixes: #20762
    
    Signed-off-by: Zhi-Jun You <hujy652 at protonmail.com>
    Link: https://github.com/openwrt/openwrt/pull/20768
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 .../config/wifi-scripts/files-ucode/usr/share/ucode/wifi/hostapd.uc   | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/package/network/config/wifi-scripts/files-ucode/usr/share/ucode/wifi/hostapd.uc b/package/network/config/wifi-scripts/files-ucode/usr/share/ucode/wifi/hostapd.uc
index db3bffe9ef..5604eb1266 100644
--- a/package/network/config/wifi-scripts/files-ucode/usr/share/ucode/wifi/hostapd.uc
+++ b/package/network/config/wifi-scripts/files-ucode/usr/share/ucode/wifi/hostapd.uc
@@ -150,8 +150,10 @@ function device_htmode_append(config) {
 	/* 802.11n */
 	config.ieee80211n = 0;
 	if (config.band != '6g') {
-		if (config.htmode in [ 'VHT20', 'HT20', 'HE20', 'EHT20' ])
+		if (config.htmode in [ 'VHT20', 'HT20', 'HE20', 'EHT20' ]) {
 			config.ieee80211n = 1;
+			config.ht_capab = '';
+		}
 		if (config.htmode in [ 'HT40', 'HT40+', 'HT40-', 'VHT40', 'VHT80', 'VHT160', 'HE40', 'HE80', 'HE160', 'EHT40', 'EHT80', 'EHT160' ]) {
 			config.ieee80211n = 1;
 			if (!config.channel)