fix nvme sqsize on off regression

[Christoph Hellwig]

Hi all,

this series fixes up the sqsize regression that Hugh reported.  The first
two patches are the real fixes, and it might make sense if Linus just
picks them directly before -rc1.  The other two just clean things up a
bit to avoid pitfalls like this in the future.

Diffstat:
 apple.c   |    3 +--
 core.c    |   21 ++++++++++++++++++---
 fabrics.c |    2 +-
 fc.c      |   12 ++++++------
 pci.c     |   27 ++++++++++++---------------
 rdma.c    |   23 +++++++++++------------
 tcp.c     |   12 ++++++------
 7 files changed, 55 insertions(+), 45 deletions(-)