nvme: fix setting the queue depth in nvme_alloc_io_tag_set

While the CAP.MQES field in NVMe is a 0s based filed with a natural one
off, we also need to account for the queue wrap condition and fix undo
the one off again in nvme_alloc_io_tag_set.  This was never properly
done by the fabrics drivers, but they don't seem to care because there
is no actual physical queue that can wrap around, but it became a
problem when converting over the PCIe driver.  Also add back the
BLK_MQ_MAX_DEPTH check that was lost in the same commit.

Fixes: 0da7feaa5913 ("nvme-pci: use the tagset alloc/free helpers")
Reported-by: Hugh Dickins <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Tested-by: Hugh Dickins <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

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