The namespace head saves the Command Set Indicator enum, so use that
instead of the Command Set Selected. The two values are not the same.

Fixes: 831ed60c ("nvme: also return I/O command effects from nvme_command_effects")
Signed-off-by: NKeith Busch <kbusch@kernel.org>
Signed-off-by: NChristoph Hellwig <hch@lst.de>