nvme-fabrics: ignore invalid fast_io_fail_tmo values
Valid fast_io_fail_tmo values are integers >= 0 or -1 (disabled). Prevent userspace from setting arbitrary negative values. Signed-off-by: Maurizio Lombardi <mlombard@redhat.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
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