watchdog: kempld: Remove #ifdef guards for PM related functions

Use the pm_ptr() macro to handle the .suspend/.resume callbacks.

This macro allows the suspend and resume functions to be automatically
dropped by the compiler when CONFIG_SUSPEND is disabled, without having
to use #ifdef guards. Not using #ifdef guards means that the code is
always compiled independently of any Kconfig option, and thanks to that
bugs and regressions are easier to catch.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20221020185047.1001522-5-paul@crapouillou.net
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Author: pcercuei

drivers/watchdog/kempld_wdt.c

@@ -75,9 +75,7 @@ struct kempld_wdt_data {
 	struct watchdog_device		wdd;
 	unsigned int			pretimeout;
 	struct kempld_wdt_stage		stage[KEMPLD_WDT_MAX_STAGES];
-#ifdef CONFIG_PM
 	u8				pm_status_store;
-#endif
 };
 
 #define DEFAULT_TIMEOUT		30 /* seconds */
@@ -495,7 +493,6 @@ static int kempld_wdt_probe(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM
 /* Disable watchdog if it is active during suspend */
 static int kempld_wdt_suspend(struct platform_device *pdev,
 				pm_message_t message)
@@ -531,18 +528,14 @@ static int kempld_wdt_resume(struct platform_device *pdev)
 	else
 		return kempld_wdt_stop(wdd);
 }
-#else
-#define kempld_wdt_suspend	NULL
-#define kempld_wdt_resume	NULL
-#endif
 
 static struct platform_driver kempld_wdt_driver = {
 	.driver		= {
 		.name	= "kempld-wdt",
 	},
 	.probe		= kempld_wdt_probe,
-	.suspend	= kempld_wdt_suspend,
-	.resume		= kempld_wdt_resume,
+	.suspend	= pm_ptr(kempld_wdt_suspend),
+	.resume		= pm_ptr(kempld_wdt_resume),
 };
 
 module_platform_driver(kempld_wdt_driver);