Fix deadlock on janus_videoroom_rtp_forwarder_rtcp_receive

src/plugins/janus_videoroom.c

@@ -13270,6 +13270,7 @@ static void janus_videoroom_rtp_forwarder_rtcp_receive(janus_rtp_forwarder *rf,
 				janus_mutex_lock(&p->streams_mutex);
 				janus_mutex_lock(&p->rtp_forwarders_mutex);
 				if(g_hash_table_size(p->rtp_forwarders) == 0) {
+					janus_mutex_unlock(&p->streams_mutex);
 					janus_mutex_unlock(&p->rtp_forwarders_mutex);
 					return;
 				}