asfdec: restore timestamp reading code

This reverts part of:
	commit e65ab9d94f
	Author: Mans Rullgard <mans@mansr.com>
	Date:   Wed Jun 1 17:26:27 2011 +0100

	    Remove unused variables

libavformat/asfdec.c

@@ -812,7 +812,7 @@ static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb){
     ASFContext *asf = s->priv_data;
     int rsize = 1;
     int num = avio_r8(pb);
-    int64_t ts0;
+    int64_t ts0, ts1;
 
     asf->packet_segments--;
     asf->packet_key_frame = num >> 7;
@@ -839,7 +839,7 @@ static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb){
 //            av_log(s, AV_LOG_DEBUG, "\n");
             avio_skip(pb, 10);
             ts0= avio_rl64(pb);
-            avio_skip(pb, 8);;
+            ts1= avio_rl64(pb);
             avio_skip(pb, 12);
             avio_rl32(pb);
             avio_skip(pb, asf->packet_replic_size - 8 - 38 - 4);