hwmon: (nct6775) Fix non-existent ALARM warning

Skip non-existent ALARM attribute to avoid a shift-out-of-bounds
dmesg warning.

Reported-by: Doug Smythies <[email protected]>
Closes: https://lore.kernel.org/linux-hwmon/[email protected]/T/#mc69b690660eb50734a6b07506d74a119e0266f1b
Fixes: b7f1f7b ("hwmon: (nct6775) Additional TEMP registers for nct6799")
Signed-off-by: Ahmad Khalifa <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Guenter Roeck <[email protected]>

Author: thekhalifa

drivers/hwmon/nct6775-core.c

@@ -1910,6 +1910,10 @@ static umode_t nct6775_in_is_visible(struct kobject *kobj,
 	struct device *dev = kobj_to_dev(kobj);
 	struct nct6775_data *data = dev_get_drvdata(dev);
 	int in = index / 5;	/* voltage index */
+	int nr = index % 5;	/* attribute index */
+
+	if (nr == 1 && data->ALARM_BITS[in] == -1)
+		return 0;
 
 	if (!(data->have_in & BIT(in)))
 		return 0;