[PATCH AUTOSEL for 4.9 128/156] nvme: use kref_get_unless_zero in nvme_find_get_ns

From: Christoph Hellwig [ Upstream commit 2dd4122854f697afc777582d18548dded03ce5dd ] For kref_get_unless_zero to protect against lookup vs free races we need to use it in all places where we aren't guaranteed to already hold a reference. There is no such guarantee in

[PATCH AUTOSEL for 4.9 128/156] nvme: use kref_get_unless_zero in nvme_find_get_ns

From: Christoph Hellwig [ Upstream commit 2dd4122854f697afc777582d18548dded03ce5dd ] For kref_get_unless_zero to protect against lookup vs free races we need to use it in all places where we aren't guaranteed to already hold a reference. There is no such guarantee in nvme_find_get_ns, so