Fix bug in blk_rq_merge_ok
commit 7ee8e4f3 upstream. Use the right array index to reference the last element of rq->biotail->bi_io_vec[] Signed-off-by: Wenbo Wang <wenbo.wang@memblaze.com> Reviewed-by: Chong Yuan <chong.yuan@memblaze.com> Fixes: 66cb45aa ("block: add support for limiting gaps in SG lists") Signed-off-by: Jens Axboe <axboe@fb.com> Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
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