qcacmn: Initialize tdls peer sta_id

TDLS sta_id check logic has changed, the value zero is valid, so
initialize the tdls peer sta_id as 0xff, otherwise add tdls peer
won't happen.

Change-Id: I805e4abdec8806f649d15da4f02980de9ffdc0ea
CRs-Fixed: 2263523

core/src/wlan_tdls_peer.c

@@ -185,6 +185,7 @@ static struct tdls_peer *tdls_add_peer(struct tdls_vdev_priv_obj *vdev_obj,
 		tdls_find_opclass(soc_obj->soc,
 				  peer->pref_off_chan_num,
 				  soc_obj->tdls_configs.tdls_pre_off_chan_bw);
+	peer->sta_id = INVALID_TDLS_PEER_ID;
 
 	qdf_list_insert_back(head, &peer->node);