RTC/watchdog: M41T80: fix a potential use of unitialized data

Watchdog handlers within the driver make use of "save_client" -- make sure it
has been initalized before the handlers are registered.

Signed-off-by: Maciej W. Rozycki <[e-mail]>
Cc: Alessandro Zummo <[e-mail]>
Cc: Alexander Bigga <[e-mail]>
Cc: Wim Van Sebroeck <[e-mail]>
Cc: David Brownell <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/rtc/rtc-m41t80.c

···
 
 #ifdef CONFIG_RTC_DRV_M41T80_WDT
 	if (clientdata->features & M41T80_FEATURE_HT) {
+		save_client = client;
 		rc = misc_register(&wdt_dev);
 		if (rc)
 			goto exit;
···
 			misc_deregister(&wdt_dev);
 			goto exit;
 		}
-		save_client = client;
 	}
 #endif
 	return 0;