[PATCH v10] nvme-fabrics: reject I/O to offline device

[Christoph Hellwig]

I tried to apply this, but first it didn't apply as it expected
to be indented differently from how it is in nvme-5.11.  After
fixing this up the commit message didn't show up as it isn't placed
correctly in this mail, and the code did not compile because
nvme_stop_failfast_work and nvme_start_failfast_work do not actually
exist.  Can you please resend against nvme-5.11?