wlcore: invalidate keep-alive template on disconnection

Previously, invalidation of the keep-alive template was
done when going idle. However, while removing the
idle-handling we didn't move the keep-alive template
invalidation to another place.

This finally resulted in fw error when trying to use
the keep-alive template by another role.

(Note that we still have an error here - each role
should have its unique keep-alive template id, while
currently they all use CMD_TEMPL_KLV_IDX_NULL_DATA (0).
This only works now because we don't support concurrent
connected stations yet)
Signed-off-by: NEliad Peller <eliad@wizery.com>
Signed-off-by: NLuciano Coelho <luca@coelho.fi>

drivers/net/wireless/ti/wlcore/main.c

@@ -2544,6 +2544,11 @@ static int wl1271_unjoin(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 		ieee80211_chswitch_done(vif, false);
 	}
 
+	/* invalidate keep-alive template */
+	wl1271_acx_keep_alive_config(wl, wlvif,
+				     CMD_TEMPL_KLV_IDX_NULL_DATA,
+				     ACX_KEEP_ALIVE_TPL_INVALID);
+
 	/* to stop listening to a channel, we disconnect */
 	ret = wl12xx_cmd_role_stop_sta(wl, wlvif);
 	if (ret < 0)