net/mlx4: Verify port number in __mlx4_unregister_mac
Verify port number to avoid crashes if port number is outside the range. Signed-off-by: Eli Cohen <eli@mellanox.com> Signed-off-by: Eugenia Emantayev <eugenia@mellanox.com> Signed-off-by: Amir Vadai <amirv@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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