net: dsa: Move skb_unshare() to dsa_switch_rcv()

All DSA tag receive functions need to unshare the skb before mangling it, move
this to the generic dsa_switch_rcv() function which will allow us to make the
tag receive function return their mangled skb without caring about freeing a
NULL skb.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 6cad15d..d370c8b 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -906,6 +906,10 @@
 		return 0;
 	}
 
+	skb = skb_unshare(skb, GFP_ATOMIC);
+	if (!skb)
+		return 0;
+
 	return dst->rcv(skb, dev, pt, orig_dev);
 }