[WATCHDOG] trivial fix two returns in void functions

This patch fixes two returns in the TI Davinci and
PNX4008 in void functions.
Signed-off-by: Florian Fainelli <florian.fainelli@telecomint.eu>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

drivers/watchdog/davinci_wdt.c

@@ -262,7 +262,7 @@ static int __init davinci_wdt_init(void)
 
 static void __exit davinci_wdt_exit(void)
 {
-	return platform_driver_unregister(&platform_wdt_driver);
+	platform_driver_unregister(&platform_wdt_driver);
 }
 
 module_init(davinci_wdt_init);

drivers/watchdog/pnx4008_wdt.c

@@ -335,7 +335,7 @@ static int __init pnx4008_wdt_init(void)
 
 static void __exit pnx4008_wdt_exit(void)
 {
-	return platform_driver_unregister(&platform_wdt_driver);
+	platform_driver_unregister(&platform_wdt_driver);
 }
 
 module_init(pnx4008_wdt_init);