af_ieee802154: fix check on broadcast address

This patch fixes an issue which was introduced by commit
b70ab2e87f17176d18f67ef331064441a032b5f3 ("ieee802154: enforce
consistent endianness in the 802.15.4 stack").

The correct behaviour should be a check on the broadcast address field
which is 0xffff.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Reported-by: Jan Luebbe <jlu@pengutronix.de>
Cc: Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ieee802154/af_ieee802154.c

@@ -63,7 +63,7 @@ ieee802154_get_dev(struct net *net, const struct ieee802154_addr *addr)
 	case IEEE802154_ADDR_SHORT:
 		if (addr->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST) ||
 		    addr->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
-		    addr->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF))
+		    addr->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST))
 			break;
 
 		rtnl_lock();