Fix default value of time_offset_length.

Patch by John Stebbins stebbins jetheaddev com.

Originally committed as revision 25374 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h264_ps.c

@@ -289,6 +289,7 @@ int ff_h264_decode_seq_parameter_set(H264Context *h){
     if(sps == NULL)
         return -1;
 
+    sps->time_offset_length = 24;
     sps->profile_idc= profile_idc;
     sps->level_idc= level_idc;