net: Make static

Sparse asked whether these could be static.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/rxrpc/ar-connevent.c b/net/rxrpc/ar-connevent.c
index 1ada43d..dc5cb1e 100644
--- a/net/rxrpc/ar-connevent.c
+++ b/net/rxrpc/ar-connevent.c
@@ -126,7 +126,7 @@
  * mark a call as being on a now-secured channel
  * - must be called with softirqs disabled
  */
-void rxrpc_call_is_secure(struct rxrpc_call *call)
+static void rxrpc_call_is_secure(struct rxrpc_call *call)
 {
 	_enter("%p", call);
 	if (call) {