[DVDnav-discuss] Fix crashes with some DVDs on describe_title

[Jean-Baptiste Kempf]

libdvdnav | branch: master | Jean-Baptiste Kempf <jb at videolan.org> | Tue Sep  1 16:00:59 2015 +0200| [8a270d6dd40ac43c98c948fe9d10e5bcb4aa3d41] | committer: Jean-Baptiste Kempf

Fix crashes with some DVDs on describe_title

This is a stop-over, but the actual issue is not fixed

> http://git.videolan.org/gitweb.cgi/libdvdnav.git/?a=commit;h=8a270d6dd40ac43c98c948fe9d10e5bcb4aa3d41
---

 src/searching.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/searching.c b/src/searching.c
index 70c0f85..f638b61 100644
--- a/src/searching.c
+++ b/src/searching.c
@@ -644,6 +644,11 @@ uint32_t dvdnav_describe_title_chapters(dvdnav_t *this, int32_t title, uint64_t
   if(!tmp)
     goto fail;
 
+  if(!ptt) {
+      printerr("ptt NULL");
+      goto fail;
+  }
+
   length = 0;
   for(i=0; i<parts; i++) {
     uint32_t cellnr, endcellnr;