The previous round of loosening the phrasebook checking to allow

playback of some older (pre-1.0) files removed an [implicit] check
against phrasebook dim being set to zero.  Reinstate as an explicit
check.



git-svn-id: https://svn.xiph.org/trunk/Tremor@17542 0101bb08-14d6-0310-b084-bc0e0c8e3800

res012.c

@@ -136,6 +136,7 @@ vorbis_info_residue *res0_unpack(vorbis_info *vi,oggpack_buffer *opb){
     int entries = ci->book_param[info->groupbook]->entries;
     int dim = ci->book_param[info->groupbook]->dim;
     int partvals = 1;
+    if (dim<1) goto errout;
     while(dim>0){
       partvals *= info->partitions;
       if(partvals > entries) goto errout;