nvme-fabrics: remove unnecessary braces for case

Braces are not required for enum value NVME_SC_CONNECT_INVALID_PARAM
when used on the switch-case statement, remove the braces.

Signed-off-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>