blk-mq: simplify blk_mq_realloc_tag_set_tags

Use set->nr_hw_queues for the current number of tags, and remove the
duplicate set->nr_hw_queues update in the caller.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20221109100811.2413423-2-hch@lst.de


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