hostapd: Add wowlan_triggers config param

New kernels in wiphy_suspend() will call cfg80211_leave_all()
that will eventually end up in cfg80211_stop_ap() unless
wowlan_triggers were set.

Bug: 17269024

Change-Id: I14d2191eda090cd86cabe1e5f059975fdf2f69e8
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
diff --git a/src/ap/ap_config.c b/src/ap/ap_config.c
index bc9f6cf..d127550 100644
--- a/src/ap/ap_config.c
+++ b/src/ap/ap_config.c
@@ -541,6 +541,8 @@
 
 	os_free(conf->sae_groups);
 
+	os_free(conf->wowlan_triggers);
+
 	os_free(conf->server_id);
 
 	os_free(conf);