nvme-fc: fail new connections to a deleted host or remote port

The lldd may have made calls to delete a remote port or local port and
the delete is in progress when the cli then attempts to create a new
controller. Currently, this proceeds without error although it can't be
very successful.

Fix this by validating that both the host port and remote port are
present when a new controller is to be created.

Signed-off-by: James Smart <[email protected]>
Reviewed-by: Himanshu Madhani <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>

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