net/mlx5e: Lag, Fix fib_info pointer assignment

Referenced change incorrectly sets single path fib_info even when LAG is
not active. Fix it by moving call to mlx5_lag_fib_set() into conditional
that verifies LAG state.

Fixes: ad11c4f1 ("net/mlx5e: Lag, Only handle events from highest priority multipath entry")
Signed-off-by: Vlad Buslov <vladbu@nvidia.com>
Reviewed-by: Maor Dickman <maord@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/lag/mp.c

@@ -149,9 +149,9 @@ static void mlx5_lag_fib_route_event(struct mlx5_lag *ldev,
 
 			i++;
 			mlx5_lag_set_port_affinity(ldev, i);
+			mlx5_lag_fib_set(mp, fi);
 		}
 
-		mlx5_lag_fib_set(mp, fi);
 		return;
 	}