hwmon: (occ) Mark occ_init_attribute() as __printf

This is a printf-style function, which gcc -Werror=suggest-attribute=format
correctly points out:

drivers/hwmon/occ/common.c: In function 'occ_init_attribute':
drivers/hwmon/occ/common.c:761:9: error: function 'occ_init_attribute' might be a candidate for 'gnu_printf' format attribute [-Werror=suggest-attribute=format]

Add the attribute to avoid this warning and ensure any incorrect
format strings are detected here.

Fixes: 744c2fe ("hwmon: (occ) Rework attribute registration for stack usage")
Signed-off-by: Arnd Bergmann <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Guenter Roeck <[email protected]>

Author: arndb

drivers/hwmon/occ/common.c

@@ -749,6 +749,7 @@ static ssize_t occ_show_extended(struct device *dev,
  * are dynamically allocated, we cannot use the existing kernel macros which
  * stringify the name argument.
  */
+__printf(7, 8)
 static void occ_init_attribute(struct occ_attribute *attr, int mode,
 	ssize_t (*show)(struct device *dev, struct device_attribute *attr, char *buf),
 	ssize_t (*store)(struct device *dev, struct device_attribute *attr,