Merge tag 'for-4.20-rc5-tag' of git://

Pull btrfs fix from David Sterba:
 "A patch in 4.19 introduced a sanity check that was too strict and a
  filesystem cannot be mounted.

  This happens for filesystems with more than 10 devices and has been
  reported by a few users so we need the fix to propagate to stable"

* tag 'for-4.20-rc5-tag' of git://
  btrfs: tree-checker: Don't check max block group size as current max chunk size limit is unreliable