Adjusted reply of isoburn_disc_get_msc1() to eventual -rom_toc_scan result

libisoburn/isoburn.c

@@ -112,6 +112,7 @@ int isoburn_new(struct isoburn **objpt, int flag)
 
  o->drive= NULL;
  o->emulation_mode= 0;
+ o->fabricated_msc1= -1;
  o->zero_nwa= Libisoburn_overwriteable_starT;
  o->min_start_byte= o->zero_nwa * 2048;
  o->nwa= o->zero_nwa;