* grub-core/fs/btrfs.c (grub_btrfs_mount): Transform out of range into

badfs.
	Reported by: TiCPU.

grub-core/fs/btrfs.c

@@ -60,6 +60,9 @@ grub_btrfs_mount (grub_disk_t disk)
   return data;
 
  fail:
+  if (grub_errno == GRUB_ERR_OUT_OF_RANGE)
+    grub_error (GRUB_ERR_BAD_FS, "not a Btrfs filesystem");
+
   grub_free (data);
   return NULL;
 }