hwmon: (hp-wmi-sensors) fix debugfs check

Checking for Kconfig symbols with #if is wrong:

drivers/hwmon/hp-wmi-sensors.c:1141:5: error: "CONFIG_DEBUG_FS" is not defined, evaluates to 0 [-Werror=undef]

This could be an #ifdef, but an IS_ENABLED() check is even better to
give the best compile coverage.

Fixes: 23902f98 ("hwmon: add HP WMI Sensors driver")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: James Seo <james@equiv.tech>
Link: https://lore.kernel.org/r/20230601213216.3220550-1-arnd@kernel.orgSigned-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/hp-wmi-sensors.c

@@ -1138,8 +1138,6 @@ static int hp_wmi_update_info(struct hp_wmi_sensors *state,
 	return ret;
 }
 
-#if CONFIG_DEBUG_FS
-
 static int basic_string_show(struct seq_file *seqf, void *ignored)
 {
 	const char *str = seqf->private;
@@ -1341,16 +1339,6 @@ static void hp_wmi_debugfs_init(struct device *dev, struct hp_wmi_info *info,
 	}
 }
 
-#else
-
-static void hp_wmi_debugfs_init(struct device *dev, struct hp_wmi_info *info,
-				struct hp_wmi_platform_events *pevents,
-				u8 icount, u8 pcount, bool is_new)
-{
-}
-
-#endif
-
 static umode_t hp_wmi_hwmon_is_visible(const void *drvdata,
 				       enum hwmon_sensor_types type,
 				       u32 attr, int channel)
@@ -1959,7 +1947,8 @@ static int hp_wmi_sensors_init(struct hp_wmi_sensors *state)
 	if (err)
 		return err;
 
-	hp_wmi_debugfs_init(dev, info, pevents, icount, pcount, is_new);
+	if (IS_ENABLED(CONFIG_DEBUG_FS))
+		hp_wmi_debugfs_init(dev, info, pevents, icount, pcount, is_new);
 
 	if (!count)
 		return 0;	/* No connected sensors; debugfs only. */