stream_dvd: prevent segmentation fault with some broken files

I have a sample where some final chapters are missing. This was causing a
segmentation fault when trying to fetch chapter times for them.

This makes the code ignore those chapters.

1 files changed, 2 insertions, 2 deletions

diff --git a/stream/stream_dvd.c b/stream/stream_dvd.c
index 0372e6c3c0..af7606ebf4 100644
--- a/stream/stream_dvd.c
+++ b/stream/stream_dvd.c
@@ -496,7 +496,7 @@ static int get_chapter_time(ifo_handle_t *vts_file, tt_srpt_t *tt_srpt, int titl
             last_cell = pgc->program_map[ptt[i].pgn];
         else
             last_cell = 0;
-        do {
+        while (cell < last_cell) {
             if(!(pgc->cell_playback[cell-1].block_type == BLOCK_TYPE_ANGLE_BLOCK &&
                  pgc->cell_playback[cell-1].block_mode != BLOCK_MODE_FIRST_CELL)
             ) {
@@ -508,7 +508,7 @@ static int get_chapter_time(ifo_handle_t *vts_file, tt_srpt_t *tt_srpt, int titl
                 cur++;
             }
             cell++;
-        } while(cell < last_cell);
+        }
     }
     return 0;
 }