Pull btrfs fix from David Sterba:
 "One more fix that verifies that the snapshot source is a root, same
  check is also done in user space but should be done by the ioctl as
  well"

* tag 'for-6.7-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: do not allow non subvolume root targets for snapshot