iscsit: mark various functions static

This patch marks a number of functions static to appease sparse static
checking.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 632a5ae..cca6d13 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -427,7 +427,7 @@
 	return 0;
 }
 
-int iscsit_del_np_comm(struct iscsi_np *np)
+static int iscsit_del_np_comm(struct iscsi_np *np)
 {
 	if (np->np_socket)
 		sock_release(np->np_socket);