watchdog: twl4030: 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/twl4030_wdt.c

···
 	return devm_watchdog_register_device(dev, wdt);
 }
 
-#ifdef CONFIG_PM
 static int twl4030_wdt_suspend(struct platform_device *pdev, pm_message_t state)
 {
 	struct watchdog_device *wdt = platform_get_drvdata(pdev);
···
 
 	return 0;
 }
-#else
-#define twl4030_wdt_suspend        NULL
-#define twl4030_wdt_resume         NULL
-#endif
 
 static const struct of_device_id twl_wdt_of_match[] = {
 	{ .compatible = "ti,twl4030-wdt", },
···
 
 static struct platform_driver twl4030_wdt_driver = {
 	.probe		= twl4030_wdt_probe,
-	.suspend	= twl4030_wdt_suspend,
-	.resume		= twl4030_wdt_resume,
+	.suspend	= pm_ptr(twl4030_wdt_suspend),
+	.resume		= pm_ptr(twl4030_wdt_resume),
 	.driver		= {
 		.name		= "twl4030_wdt",
 		.of_match_table	= twl_wdt_of_match,