net: dsa: Do not check for NULL dst in tag parsers

dsa_switch_rcv() already tests for dst == NULL, so there is no need to duplicate
the same check within the tag receive functions.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/dsa/tag_brcm.c

@@ -100,9 +100,6 @@ static int brcm_tag_rcv(struct sk_buff *skb, struct net_device *dev,
 	int source_port;
 	u8 *brcm_tag;
 
-	if (unlikely(dst == NULL))
-		goto out_drop;
-
 	ds = dst->cpu_switch;
 
 	skb = skb_unshare(skb, GFP_ATOMIC);

net/dsa/tag_dsa.c

@@ -77,9 +77,6 @@ static int dsa_rcv(struct sk_buff *skb, struct net_device *dev,
 	int source_device;
 	int source_port;
 
-	if (unlikely(dst == NULL))
-		goto out_drop;
-
 	skb = skb_unshare(skb, GFP_ATOMIC);
 	if (skb == NULL)
 		goto out;

net/dsa/tag_edsa.c

@@ -90,9 +90,6 @@ static int edsa_rcv(struct sk_buff *skb, struct net_device *dev,
 	int source_device;
 	int source_port;
 
-	if (unlikely(dst == NULL))
-		goto out_drop;
-
 	skb = skb_unshare(skb, GFP_ATOMIC);
 	if (skb == NULL)
 		goto out;

net/dsa/tag_mtk.c

@@ -55,9 +55,6 @@ static int mtk_tag_rcv(struct sk_buff *skb, struct net_device *dev,
 	int port;
 	__be16 *phdr, hdr;
 
-	if (unlikely(!dst))
-		goto out_drop;
-
 	skb = skb_unshare(skb, GFP_ATOMIC);
 	if (!skb)
 		goto out;

net/dsa/tag_qca.c

@@ -75,9 +75,6 @@ static int qca_tag_rcv(struct sk_buff *skb, struct net_device *dev,
 	int port;
 	__be16 *phdr, hdr;
 
-	if (unlikely(!dst))
-		goto out_drop;
-
 	skb = skb_unshare(skb, GFP_ATOMIC);
 	if (!skb)
 		goto out;

net/dsa/tag_trailer.c

@@ -66,8 +66,6 @@ static int trailer_rcv(struct sk_buff *skb, struct net_device *dev,
 	u8 *trailer;
 	int source_port;
 
-	if (unlikely(dst == NULL))
-		goto out_drop;
 	ds = dst->cpu_switch;
 
 	skb = skb_unshare(skb, GFP_ATOMIC);