blk-mq: fold blk_cloned_rq_check_limits into blk_insert_cloned_request

Fold blk_cloned_rq_check_limits into its only caller.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Link: https://lore.kernel.org/r/20220215100540.3892965-3-hch@lst.de


Signed-off-by: Jens Axboe <axboe@kernel.dk>