nvme-5.11-2021-01-14

nvme fixes for 5.11:

 - don't initialize hwmon for discover controllers (Sagi Grimberg)
 - fix iov_iter handling in nvme-tcp (Sagi Grimberg)
 - fix a preempt warning in nvme-tcp (Sagi Grimberg)
 - fix a possible NULL pointer dereference in nvme (Israel Rukshin)
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