Merge tag 'block-5.7-2020-05-22' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
 "Two fixes for null_blk zone mode"

* tag 'block-5.7-2020-05-22' of git://git.kernel.dk/linux-block:
  null_blk: don't allow discard for zoned mode
  null_blk: return error for invalid zone size