nvme-tcp: only evaluate 'tls' option if TLS is selected

We only need to evaluate the 'tls' connect option if TLS is
enabled; otherwise we might be getting a link error.

Fixes: 706add13 ("nvme: keyring: fix conditional compilation")
Reported-by: kernel test robot <yujie.liu@intel.com>
Closes: https://lore.kernel.org/r/202311140426.0eHrTXBr-lkp@intel.com/Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>

drivers/nvme/host/tcp.c

@@ -1916,7 +1916,7 @@ static int nvme_tcp_alloc_admin_queue(struct nvme_ctrl *ctrl)
 	int ret;
 	key_serial_t pskid = 0;
 
-	if (ctrl->opts->tls) {
+	if (IS_ENABLED(CONFIG_NVME_TCP_TLS) && ctrl->opts->tls) {
 		if (ctrl->opts->tls_key)
 			pskid = key_serial(ctrl->opts->tls_key);
 		else