Virtual ISO: Don't declare Rock Ridge extension on Joliet tree

src/cdrom/cdrom_image_viso.c

@@ -1102,6 +1102,7 @@ next_dir:
     }
 
     /* Write directory records for each type. */
+    int dir_type = VISO_DIR_CURRENT_ROOT;
     for (int i = 0; i < 2; i++) {
         cdrom_image_viso_log("VISO: Generating directory record set #%d:\n", i);
 
@@ -1134,7 +1135,6 @@ next_dir:
 
             /* Go through entries in this directory. */
             viso_entry_t *entry = dir->first_child;
-            int           dir_type = (dir == viso->root_dir) ? VISO_DIR_CURRENT_ROOT : VISO_DIR_CURRENT;
             while (entry) {
                 /* Skip the El Torito boot code entry if present. */
                 if (entry == viso->eltorito_entry)
@@ -1193,6 +1193,7 @@ next_entry:
                 viso_pwrite(data, dir->first_child->next->dr_offsets[i] + 10, 8, 1, viso->tf.file);
 
             /* Move on to the next directory. */
+            dir_type = VISO_DIR_CURRENT;
             dir      = dir->next_dir;
         }