rtc: max31335: use correct CONFIG symbol in IS_REACHABLE()

IS_REACHABLE() is meant to be used with full symbol names from a kernel
.config file, not the shortened symbols used in Kconfig files, so
change HWMON to CONFIG_HWMON in 3 places.

Fixes: dedaf03 ("rtc: max31335: add driver support")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://patch.msgid.link/20260108045432.2705691-1-rdunlap@infradead.org
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Author: rddunlap

drivers/rtc/rtc-max31335.c

@@ -591,7 +591,7 @@ static struct nvmem_config max31335_nvmem_cfg = {
 	.size = MAX31335_RAM_SIZE,
 };
 
-#if IS_REACHABLE(HWMON)
+#if IS_REACHABLE(CONFIG_HWMON)
 static int max31335_read_temp(struct device *dev, enum hwmon_sensor_types type,
 			      u32 attr, int channel, long *val)
 {
@@ -672,7 +672,7 @@ static int max31335_clkout_register(struct device *dev)
 static int max31335_probe(struct i2c_client *client)
 {
 	struct max31335_data *max31335;
-#if IS_REACHABLE(HWMON)
+#if IS_REACHABLE(CONFIG_HWMON)
 	struct device *hwmon;
 #endif
 	const struct chip_desc *match;
@@ -727,7 +727,7 @@ static int max31335_probe(struct i2c_client *client)
 		return dev_err_probe(&client->dev, ret,
 				     "cannot register rtc nvmem\n");
 
-#if IS_REACHABLE(HWMON)
+#if IS_REACHABLE(CONFIG_HWMON)
 	if (max31335->chip->temp_reg) {
 		hwmon = devm_hwmon_device_register_with_info(&client->dev, client->name, max31335,
 							     &max31335_chip_info, NULL);