nvme: Fix NULL dereference for pci nvme controllers
PCIe controllers do not have fabric opts, verify they exist before showing ctrl_loss_tmo or reconnect_delay attributes. Fixes: 764075fd ("nvme: expose reconnect_delay and ctrl_loss_tmo via sysfs") Reported-by: Tobias Markus <tobias@markus-regensburg.de> Reviewed-by: Keith Busch <kbusch@kernel.org> Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
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