[][MAC80211][WiFi6][mt76][Fix wrong power value in get_power]

[Description]
Fix wrong power value when user set limit close to path table limit.

[Release-log]
N/A

Change-Id: I939622c5a69760db8469242ea894c4268232849c
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8936858
1 file changed