hwmon: (nzxt-smart2) Fix "unused function" warning

Fix warning when building with CONFIG_PM=n (and CONFIG_WERROR=y):

drivers/hwmon/nzxt-smart2.c:707:12: error: ‘nzxt_smart2_hid_reset_resume’
defined but not used [-Werror=unused-function]
  707 | static int nzxt_smart2_hid_reset_resume(struct hid_device *hdev)
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
Signed-off-by: Aleksandr Mezin <mezin.alexander@gmail.com>
Link: https://lore.kernel.org/r/20211228014813.832491-1-mezin.alexander@gmail.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/nzxt-smart2.c

@@ -704,7 +704,7 @@ static int nzxt_smart2_hid_raw_event(struct hid_device *hdev,
 	return 0;
 }
 
-static int nzxt_smart2_hid_reset_resume(struct hid_device *hdev)
+static int __maybe_unused nzxt_smart2_hid_reset_resume(struct hid_device *hdev)
 {
 	struct drvdata *drvdata = hid_get_drvdata(hdev);