oggdec: Remove write-only variable

Originally committed as revision 22889 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/oggdec.c

@@ -462,7 +462,6 @@ ogg_get_length (AVFormatContext * s)
             s->streams[idx]->duration -= s->streams[idx]->start_time;
     }
 
-    ogg->size = size;
     ogg_restore (s, 0);
 
     return 0;

libavformat/oggdec.h

@@ -91,7 +91,6 @@ struct ogg {
     int nstreams;
     int headers;
     int curidx;
-    uint64_t size;
     struct ogg_state *state;
 };