This patch fixes an issue which was introduced by commit
b70ab2e8 ("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: NAlexander Aring <alex.aring@gmail.com>
Reported-by: NJan Luebbe <jlu@pengutronix.de>
Cc: Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>