mlxsw: core: remove an unnecessary condition

We checked "err" on the lines before so we know it's zero here.

These cause a static checker warning because checking known things can
indicate a bug.  Maybe there is a missing assignment or we are checking
the wrong variable.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -130,7 +130,7 @@ static ssize_t mlxsw_hwmon_temp_rst_store(struct device *dev,
 		dev_err(mlxsw_hwmon->bus_info->dev, "Failed to reset temp sensor history\n");
 		return err;
 	}
-	return err ? err : len;
+	return len;
 }
 
 static ssize_t mlxsw_hwmon_fan_rpm_show(struct device *dev,