wl1271: fix the inetdev notifier callback return values

The wl1271_dev_notify() was returning 0 or -ENODEV, when it should return
NOTIFY_* instead.  Now we use NOTIFY_DONE when we didn't handle the event or
NOTIFY_OK when we have handled it.

For inetdev notifications, it doesn't matter whether we use NOTIFY_DONE or
NOTIFY_OK, because it ignores the return value of the call to
blocking_notifier_call_chain().  But the notify.h header says that
NOTIFY_DONE is "Don't care" and NOTIFY_OK is "Suits me", so that seems to be
the right way to do it.

Reported-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Reviewed-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl12xx/wl1271_main.c

@@ -815,15 +815,15 @@ static int wl1271_dev_notify(struct notifier_block *me, unsigned long what,
 
 	wdev = dev->ieee80211_ptr;
 	if (wdev == NULL)
-		return -ENODEV;
+		return NOTIFY_DONE;
 
 	wiphy = wdev->wiphy;
 	if (wiphy == NULL)
-		return -ENODEV;
+		return NOTIFY_DONE;
 
 	hw = wiphy_priv(wiphy);
 	if (hw == NULL)
-		return -ENODEV;
+		return NOTIFY_DONE;
 
 	/* Check that the interface is one supported by this driver. */
 	wl_temp = hw->priv;
@@ -832,7 +832,7 @@ static int wl1271_dev_notify(struct notifier_block *me, unsigned long what,
 			break;
 	}
 	if (wl == NULL)
-		return -ENODEV;
+		return NOTIFY_DONE;
 
 	/* Get the interface IP address for the device. "ifa" will become
 	   NULL if:
@@ -868,7 +868,7 @@ static int wl1271_dev_notify(struct notifier_block *me, unsigned long what,
 out:
 	mutex_unlock(&wl->mutex);
 
-	return ret;
+	return NOTIFY_OK;
 }
 
 static struct notifier_block wl1271_dev_notifier = {