nvmet: remove cntlid_min and cntlid_max check in nvmet_alloc_ctrl

The cntlid_min and cntlid_max are checked in configfs, don't check
again in nvmet_alloc_ctrl().

Signed-off-by: Guixin Liu <kanie@linux.alibaba.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Keith Busch <kbusch@kernel.org>