An IFO without a VTS TMAP is very common, remove warning

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

src/ifo_read.c

@@ -1452,9 +1452,8 @@ int ifoRead_VTS_TMAPT(ifo_handle_t *ifofile) {
   if(!ifofile->vtsi_mat)
     return 0;
 
-  if(ifofile->vtsi_mat->vts_tmapt == 0) { /* optional(?) */
+  if(ifofile->vtsi_mat->vts_tmapt == 0) {
     ifofile->vts_tmapt = NULL;
-    fprintf(stderr,"libdvdread: No VTS_TMAPT available - skipping.\n");
     return 1;
   }