block: Fix front merge check
For a front merge, the maximum number of sectors of the request must be checked against the front merge BIO sector, not the current sector of the request. Signed-off-by: Damien Le Moal <damien.lemoal@hgst.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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