[PATCH 1/3] mt76: mt7663u: fix memory leak in set key

[sean.wang at mediatek.com]

From: Sean Wang <sean.wang at mediatek.com>

Thanks, I'll have the next version to remove the unneeded kfree.

>
>> +
>> +	return err;
>>  }
>>
>>  void mt7663u_wtbl_work(struct work_struct *work)