nvme: handle positive error codes in nuse_show()

Function __nvme_submit_sync_cmd() returns a positive error code for NVMe
errors. Otherwise, we get 0 for success or a negative error code for a
kernel error.

In nuse_show() -> ns_{head}_update_nuse() -> nvme_identify_ns() ->
nvme_submit_sync_cmd() -> __nvme_submit_sync_cmd(), we then may get a
positive error code returned.

Function nuse_show() - being a device attr handler - should return the
number of bytes written to the buffer or a negative error code.

Convert any positive NVMe error code to -EIO.

Signed-off-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>

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