cdrom: Properly empty the path of image if it can't be loaded

src/cdrom/cdrom_image.c

@@ -257,6 +257,7 @@ image_open_abort(cdrom_t *dev)
     cdrom_image_close(dev);
     dev->ops = NULL;
     dev->host_drive = 0;
+    dev->image_path[0] = 0;
     return 1;
 }