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 <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Guenter Roeck <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

drivers/watchdog/kempld_wdt.c

···
 	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 */
···
 	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)
···
 	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);