db/upnp/WorkQueue: remove unused "szp" parameter from take()

src/db/upnp/Discovery.cxx

@@ -109,8 +109,7 @@ discoExplorer(void *)
 {
 	for (;;) {
 		DiscoveredTask *tsk = 0;
-		size_t qsz;
-		if (!discoveredQueue.take(&tsk, &qsz)) {
+		if (!discoveredQueue.take(&tsk)) {
 			discoveredQueue.workerExit();
 			return (void*)1;
 		}

src/db/upnp/WorkQueue.hxx

@@ -241,7 +241,7 @@ public:
 	 * Sleeps if there are not enough. Signal if we go to sleep on empty
 	 * queue: client may be waiting for our going idle.
 	 */
-	bool take(T* tp, size_t *szp = 0)
+	bool take(T* tp)
 	{
 		const ScopeLock protect(m_mutex);
 
@@ -267,8 +267,6 @@ public:
 		}
 
 		*tp = m_queue.front();
-		if (szp)
-			*szp = m_queue.size();
 		m_queue.pop();
 		if (m_clients_waiting > 0) {
 			// No reason to wake up more than one client thread