net/mlx5: Avoid dereferencing uninitialized pointer
In NETDEV_CHANGEUPPER event the upper_info field is valid only when linking is true. Otherwise it should be ignored. Fixes: 7907f23a (net/mlx5: Implement RoCE LAG feature) Signed-off-by: Talat Batheesh <talatb@mellanox.com> Reviewed-by: Aviv Heller <avivh@mellanox.com> Reviewed-by: Moni Shoua <monis@mellanox.com> Signed-off-by: Saeed Mahameed <saeedm@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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