watchdog: Remove break after exit

This was dead code.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

hw/watchdog/watchdog.c

@@ -128,7 +128,6 @@ void watchdog_perform_action(void)
     case WDT_POWEROFF:          /* same as 'quit' command in monitor */
         watchdog_mon_event("poweroff");
         exit(0);
-        break;
 
     case WDT_PAUSE:             /* same as 'stop' command in monitor */
         watchdog_mon_event("pause");