Fix uninitialized use in mitsumi_cdrom_reset

src/cdrom/cdrom_mitsumi.c

@@ -145,6 +145,8 @@ mitsumi_cdrom_reset(mcd_t *dev)
 {
     cdrom_t cdrom;
     
+    cdrom.host_drive = 0;
+
     dev->stat          = cdrom.host_drive ? (STAT_READY | STAT_CHANGE) : 0;
     dev->cmdrd_count   = 0;
     dev->cmdbuf_count  = 0;