bluetooth: keys: addr is null and assert in bt_keys_find_addr

When there are br connections connected, find_key_in_use call
bt_conn_get_dst to get br connection's dst and bt_conn_get_dst return NULL,
then bt_keys_find_addr aseert because addr is NULL.

Signed-off-by: Mark Wang <yichang.wang@nxp.com>

subsys/bluetooth/host/keys.c

@@ -79,7 +79,7 @@ static bool key_is_in_use(uint8_t id)
 {
 	struct key_data kdata = { false, id };
 
-	bt_conn_foreach(BT_CONN_TYPE_ALL, find_key_in_use, &kdata);
+	bt_conn_foreach(BT_CONN_TYPE_LE, find_key_in_use, &kdata);
 
 	return kdata.in_use;
 }