uml: fix nonremovability of watchdog

The UML watchdog driver was using the wrong config variable to control whether
it can be unloaded once active.
Signed-off-by: NJeff Dike <jdike@linux.intel.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

arch/um/drivers/harddog_kern.c

@@ -69,7 +69,7 @@ static int harddog_open(struct inode *inode, struct file *file)
 	spin_lock(&lock);
 	if(timer_alive)
 		goto err;
-#ifdef CONFIG_HARDDOG_NOWAYOUT
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
 	__module_get(THIS_MODULE);
 #endif