hwmon: (tmp103) Fix build warning

If CONFIG_OF is not enabled, the following build warning is observed.

drivers/hwmon/tmp103.c:173:34: warning:
	‘tmp103_of_match’ defined but not used

Marking tmp103_of_match as __maybe_unused fixes the problem.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/tmp103.c

@@ -170,7 +170,7 @@ static const struct i2c_device_id tmp103_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, tmp103_id);
 
-static const struct of_device_id tmp103_of_match[] = {
+static const struct of_device_id __maybe_unused tmp103_of_match[] = {
 	{ .compatible = "ti,tmp103" },
 	{ },
 };