hwmon: (max20730) fix Wvoid-pointer-to-enum-cast warning

'chip_id' is an enum, thus cast of pointer on 64-bit compile test with W=1
causes:

  max20730.c:719:13: error: cast to smaller integer type 'enum chips' from 'const void *' [-Werror,-Wvoid-pointer-to-enum-cast]

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230810093157.94244-9-krzysztof.kozlowski@linaro.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Author: krzk

drivers/hwmon/pmbus/max20730.c

@@ -716,7 +716,7 @@ static int max20730_probe(struct i2c_client *client)
 	}
 
 	if (client->dev.of_node)
-		chip_id = (enum chips)of_device_get_match_data(dev);
+		chip_id = (uintptr_t)of_device_get_match_data(dev);
 	else
 		chip_id = i2c_match_id(max20730_id, client)->driver_data;