qcacld-3.0: Change notifier call to only return valid NOTIFY values

When values such as -EAGAIN are returned as the return value, it causes
the notifier block chain to stop being parsed by ip6_route_dev_notify(),
which results in the pointer to nh_dev in fib6 being NULL since the value
is not able to be set. To solve this, set hdd_netdev_notifier_call to
return NOTIFY_DONE so that the error value returned does not prevent the
notifier block chain from progressing.

Change-Id: I294a837e9f6c9712d45a9a96b5f0967af968b8b6
CRs-Fixed: 2553168

core/hdd/src/wlan_hdd_main.c

@@ -1056,13 +1056,13 @@ static int hdd_netdev_notifier_call(struct notifier_block *nb,
 
 	errno = osif_vdev_sync_op_start(net_dev, &vdev_sync);
 	if (errno)
-		return errno;
+		return NOTIFY_DONE;
 
 	errno = __hdd_netdev_notifier_call(net_dev, state);
 
 	osif_vdev_sync_op_stop(vdev_sync);
 
-	return errno;
+	return NOTIFY_DONE;
 }
 
 struct notifier_block hdd_netdev_notifier = {