FS-11750: JB fix: avoid infinite loop when chan var rtp_nack_buffer_size is…

FS-11750: JB fix: avoid infinite loop when chan var rtp_nack_buffer_size is small (initial max_packet_len)

src/switch_jitterbuffer.c

@@ -1256,11 +1256,14 @@ SWITCH_DECLARE(switch_status_t) switch_jb_put_packet(switch_jb_t *jb, switch_rtp
 
 	add_node(jb, packet, len);
 
-	if (switch_test_flag(jb, SJB_QUEUE_ONLY) && jb->max_packet_len 
-			&& jb->allocated_nodes > jb->max_frame_len * 2 - 1) {
+	if (switch_test_flag(jb, SJB_QUEUE_ONLY) && jb->max_packet_len && jb->max_frame_len * 2 > jb->max_packet_len &&
+			jb->allocated_nodes > jb->max_frame_len * 2 - 1) {
 		while ((jb->max_frame_len * 2 - jb->visible_nodes) < jb->max_packet_len) {
 			drop_oldest_frame(jb);
 		}
+	} else if (switch_test_flag(jb, SJB_QUEUE_ONLY) && jb->max_packet_len && jb->max_frame_len * 2 < jb->max_packet_len) {
+		/* rtp_nack_buffer_size less than initial max_packet_len */
+		drop_oldest_frame(jb);
 	}
 
 	switch_mutex_unlock(jb->mutex);