mlxsw: core: remove an unneeded condition

We already know "err" is zero so there is no need to check.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Acked-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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

@@ -169,7 +169,7 @@ static ssize_t mlxsw_hwmon_pwm_store(struct device *dev,
 		dev_err(mlxsw_hwmon->bus_info->dev, "Failed to write PWM\n");
 		return err;
 	}
-	return err ? err : len;
+	return len;
 }
 
 enum mlxsw_hwmon_attr_type {