ll_queue: inline→static inline queue_waiter_call — fix link error with -Og

lib/ll_queue.c

@@ -308,7 +308,7 @@ static void waiter_defer_cb(void* arg) {
     h->defer_cb(h->defer_q, h->defer_arg);
 }
 
-inline void queue_waiter_call(struct ll_queue* q, queue_threshold_callback_fn cb, void* arg,
+static inline void queue_waiter_call(struct ll_queue* q, queue_threshold_callback_fn cb, void* arg,
                                struct queue_waiter_handle* h) {
     if (q->waiter_defer) {
         h->defer_q = q; h->defer_cb = cb; h->defer_arg = arg;