mlxsw: spectrum_router: Drop unnecessary WARN_ON_ONCE()

In case the register access failed an error would be logged anyway, so
we can drop the warning.
Signed-off-by: NIdo Schimmel <idosch@mellanox.com>
Acked-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c

@@ -6142,7 +6142,7 @@ static int mlxsw_sp_router_rif_disable(struct mlxsw_sp *mlxsw_sp, u16 rif)
 
 	mlxsw_reg_ritr_rif_pack(ritr_pl, rif);
 	err = mlxsw_reg_query(mlxsw_sp->core, MLXSW_REG(ritr), ritr_pl);
-	if (WARN_ON_ONCE(err))
+	if (err)
 		return err;
 
 	mlxsw_reg_ritr_enable_set(ritr_pl, false);