oggz_auto_dirac: check malloc return

git-svn-id: http://svn.annodex.net/liboggz/trunk@3866 8158c8cd-e7e1-0310-9fa4-c5954c97daef

src/liboggz/oggz_auto.c

@@ -367,6 +367,7 @@ auto_dirac (OGGZ * oggz, long serialno, unsigned char * data, long length, void
   dirac_info *info;
 
   info = oggz_malloc(sizeof(dirac_info));
+  if (info == NULL) return -1;
 
   dirac_parse_info(info, data, length);