net/mlx5: E-switch, Coverity: overlapping copy

When a capability is set via port function caps callbacks, a memcpy() is
performed in which the source and the target are the same address, e.g.:
the copy is redundant. Hence, Remove it.
Discovered by Coverity.

Fixes: 7db98396 ("net/mlx5: E-Switch, Implement devlink port function cmds to control RoCE")
Fixes: e5b9642a ("net/mlx5: E-Switch, Implement devlink port function cmds to control migratable")
Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c

@@ -4143,8 +4143,6 @@ int mlx5_devlink_port_fn_migratable_set(struct devlink_port *port, bool enable,
 	}
 
 	hca_caps = MLX5_ADDR_OF(query_hca_cap_out, query_ctx, capability);
-	memcpy(hca_caps, MLX5_ADDR_OF(query_hca_cap_out, query_ctx, capability),
-	       MLX5_UN_SZ_BYTES(hca_cap_union));
 	MLX5_SET(cmd_hca_cap_2, hca_caps, migratable, 1);
 
 	err = mlx5_vport_set_other_func_cap(esw->dev, hca_caps, vport->vport,
@@ -4236,8 +4234,6 @@ int mlx5_devlink_port_fn_roce_set(struct devlink_port *port, bool enable,
 	}
 
 	hca_caps = MLX5_ADDR_OF(query_hca_cap_out, query_ctx, capability);
-	memcpy(hca_caps, MLX5_ADDR_OF(query_hca_cap_out, query_ctx, capability),
-	       MLX5_UN_SZ_BYTES(hca_cap_union));
 	MLX5_SET(cmd_hca_cap, hca_caps, roce, enable);
 
 	err = mlx5_vport_set_other_func_cap(esw->dev, hca_caps, vport_num,