dsa: tag_dsa: Fix mask for trunked packets

A packet received on a trunk will have bit 2 set in Forward DSA tagged
frame. Bit 1 can be either 0 or 1 and is otherwise undefined and bit 0
indicates the frame CFI. Masking with 7 thus results in frames as
being identified as being from a trunk when in fact they are not. Fix
the mask to just look at bit 2.

Fixes: 5b60dadb ("net: dsa: tag_dsa: Support reception of packets from LAG devices")
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/dsa/tag_dsa.c

@@ -210,7 +210,7 @@ static struct sk_buff *dsa_rcv_ll(struct sk_buff *skb, struct net_device *dev,
 	cmd = dsa_header[0] >> 6;
 	switch (cmd) {
 	case DSA_CMD_FORWARD:
-		trunk = !!(dsa_header[1] & 7);
+		trunk = !!(dsa_header[1] & 4);
 		break;
 
 	case DSA_CMD_TO_CPU: