nvme: remove the NVME_NS_DEAD check in nvme_remove_invalid_namespaces

nvme: remove the NVME_NS_DEAD check in nvme_remove_invalid_namespaces

The NVME_NS_DEAD check only made sense when we revalidated namespaces
in nvme_passthrough_end for commands that affected the namespace inventory.
These days NVME_NS_DEAD is only set during reset or when tearing down
namespaces, and we always remove all namespaces right after that.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20221101150050.3510-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>