batman-adv: deselect current GW on client mode switch off

When switching from gw_mode client to either off or server
the current selected gateway has to be deselected.
In this way when client mode is enabled again a gateway
re-election is forced and a GW_ADD event is consequently
sent.

The current behaviour instead is to keep the current gateway
leading to no GW_ADD event when gw_mode client is selected
for a second time

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c
index 3564173..53a9009 100644
--- a/net/batman-adv/gateway_client.c
+++ b/net/batman-adv/gateway_client.c
@@ -205,6 +205,11 @@
 	if (!curr_gw)
 		return;
 
+	/* deselect the current gateway so that next time that client mode is
+	 * enabled a proper GW_ADD event can be sent
+	 */
+	batadv_gw_select(bat_priv, NULL);
+
 	/* if batman-adv is switching the gw client mode off and a gateway was
 	 * already selected, send a DEL uevent
 	 */