nvme: remove unused return code from nvme_alloc_ns

The return code of nvme_alloc_ns is never used, so change it
to void.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Edmund Nadolski <edmund.nadolski@intel.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
1 file changed