nvme-core: remove unnecessary semicolon

It is not a good practice to have a semicolon at the end of the
function definition. Remove it from nvme_pr_type().

Signed-off-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>