Add missing BUILD_BUG_SQE_ELEM() for ->buf_group verifying that SQE
layout doesn't change.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/1f9d21bd74599b856b3a632be4c23ffa184a3ef0.1624543113.git.asml.silence@gmail.comSigned-off-by: Jens Axboe <axboe@kernel.dk>