net: macb: OR vs AND typos

The bitwise tests are always true here because it uses '|' where '&' is
intended.

Fixes: 98b5a0f4

 ('net: macb: Add support for jumbo frames')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>