nvmet-rdma: declare local symbols static

This patch avoids that sparse complains about missing declarations.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/nvme/target/rdma.c

@@ -122,7 +122,7 @@ struct nvmet_rdma_device {
 	int			inline_page_count;
 };
 
-struct workqueue_struct *nvmet_rdma_delete_wq;
+static struct workqueue_struct *nvmet_rdma_delete_wq;
 static bool nvmet_rdma_use_srq;
 module_param_named(use_srq, nvmet_rdma_use_srq, bool, 0444);
 MODULE_PARM_DESC(use_srq, "Use shared receive queue.");