don't drop the queue reference in blk_mq_destroy_queue

[Christoph Hellwig]

Hi all,

currently blk_mq_destroy_queue not only shuts down the queue, but also
drops a queue references, which leads to the NVMe PCIe/Apple drivers and
scsi grabbing an extra references. Fix this to help with unifying more
code between the various NVMe drivers (and to make the code a little saner
even on it's own).

Diffstat:
 block/blk-mq.c            |    4 +---
 block/bsg-lib.c           |    2 ++
 drivers/nvme/host/apple.c |    8 --------
 drivers/nvme/host/core.c  |   10 ++++++++--
 drivers/nvme/host/pci.c   |    5 -----
 drivers/scsi/scsi_scan.c  |    1 -
 drivers/ufs/core/ufshcd.c |    2 ++
 7 files changed, 13 insertions(+), 19 deletions(-)