mt76: mt7615: Use kmemdup in mt7615_queue_key_update()

Use kmemdup rather than duplicating its implementation
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7615/main.c

@@ -290,12 +290,11 @@ mt7615_queue_key_update(struct mt7615_dev *dev, enum set_key_cmd cmd,
 	wd->type = MT7615_WTBL_KEY_DESC;
 	wd->sta = msta;
 
-	wd->key.key = kzalloc(key->keylen, GFP_KERNEL);
+	wd->key.key = kmemdup(key->key, key->keylen, GFP_KERNEL);
 	if (!wd->key.key) {
 		kfree(wd);
 		return -ENOMEM;
 	}
-	memcpy(wd->key.key, key->key, key->keylen);
 	wd->key.cipher = key->cipher;
 	wd->key.keyidx = key->keyidx;
 	wd->key.keylen = key->keylen;