net: dsa: tag_ksz: Fix __be16 warnings

cpu_to_be16 returns a __be16 value. So what it is assigned to needs to
have the same type to avoid warnings.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/dsa/tag_ksz.c

@@ -156,8 +156,9 @@ static struct sk_buff *ksz9477_xmit(struct sk_buff *skb,
 {
 	struct dsa_port *dp = dsa_slave_to_port(dev);
 	struct sk_buff *nskb;
-	u16 *tag;
+	__be16 *tag;
 	u8 *addr;
+	u16 val;
 
 	nskb = ksz_common_xmit(skb, dev, KSZ9477_INGRESS_TAG_LEN);
 	if (!nskb)
@@ -167,12 +168,12 @@ static struct sk_buff *ksz9477_xmit(struct sk_buff *skb,
 	tag = skb_put(nskb, KSZ9477_INGRESS_TAG_LEN);
 	addr = skb_mac_header(nskb);
 
-	*tag = BIT(dp->index);
+	val = BIT(dp->index);
 
 	if (is_link_local_ether_addr(addr))
-		*tag |= KSZ9477_TAIL_TAG_OVERRIDE;
+		val |= KSZ9477_TAIL_TAG_OVERRIDE;
 
-	*tag = cpu_to_be16(*tag);
+	*tag = cpu_to_be16(val);
 
 	return nskb;
 }