!8335 wifi: mac80211: don't return unset power in ieee80211_get_tx_power() Merge Pull Request from: @ci-robot PR sync from: Zheng Yejian <zhengyejian1@huawei.com> https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/TT4IYQ6OPZUZ2VUW4Y27DSAW75NAYM7R/ https://gitee.com/src-openeuler/kernel/issues/I9RE6D Link:https://gitee.com/openeuler/kernel/pulls/8335 Reviewed-by: Yue Haibing <yuehaibing@huawei.com> Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>