Vobsub: language is not necessarily on 2 characters

This fixes quite a few .idx samples that didn't work before.
(cherry picked from commit a76a1d046ad221c6ac7132a064e25e5393d6ef98)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/demux/vobsub.c

@@ -518,25 +518,25 @@ static int ParseVobSubIDX( demux_t *p_demux )
         }
         else if( !strncmp( "id:", line, 3 ) )
         {
-            char language[3];
+            char language[33]; /* Usually 2 or 3 letters, sometimes more.
+                                  Spec (or lack of) doesn't define any limit */
             int i_track_id;
             es_format_t fmt;
 
             /* Lets start a new track */
-            if( sscanf( line, "id: %2s, index: %d",
+            if( sscanf( line, "id: %32[^ ,], index: %d",
                         language, &i_track_id ) == 2 )
             {
                 p_sys->i_tracks++;
                 p_sys->track = xrealloc( p_sys->track,
                           sizeof( vobsub_track_t ) * (p_sys->i_tracks + 1 ) );
-                language[2] = '\0';
 
                 /* Init the track */
                 current_tk = &p_sys->track[p_sys->i_tracks - 1];
                 memset( current_tk, 0, sizeof( vobsub_track_t ) );
                 current_tk->i_current_subtitle = 0;
                 current_tk->i_subtitles = 0;
-                current_tk->p_subtitles = xmalloc( sizeof( subtitle_t ) );;
+                current_tk->p_subtitles = xmalloc( sizeof( subtitle_t ) );
                 current_tk->i_track_id = i_track_id;
                 current_tk->i_delay = (int64_t)0;