watchdog: Fix warning

This seems to have popped up after the recent merges:

drivers/watchdog/w83697ug_wdt.c: In function ‘w83697ug_select_wd_register’:
drivers/watchdog/w83697ug_wdt.c:105: warning: ‘return’ with a value, in function returning void

Signed-off-by: Alan Cox <[e-mail]>
Acked-by: Wim Van Sebroeck <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/watchdog/w83697ug_wdt.c

···
 
 	} else {
 		printk(KERN_ERR PFX "No W83697UG/UF could be found\n");
-		return -EIO;
+		return;
 	}
 
 	outb_p(0x07, WDT_EFER); /* point to logical device number reg */