watchdog: fix set_timeout operations

Since we changed the behaviour of the set_timeout operation in the
watchdog API, we need to change the allready converted drivers so
that they update the timeout field at the end of the set_timeout
operation.

Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
diff --git a/drivers/watchdog/wm8350_wdt.c b/drivers/watchdog/wm8350_wdt.c
index 0ce572c..3c76693 100644
--- a/drivers/watchdog/wm8350_wdt.c
+++ b/drivers/watchdog/wm8350_wdt.c
@@ -60,6 +60,7 @@
 	wm8350_reg_lock(wm8350);
 	mutex_unlock(&wdt_mutex);
 
+	wdt_dev->timeout = timeout;
 	return ret;
 }