tipc: don't log disabled tasklet handler errors

Failure to schedule a TIPC tasklet with tipc_k_signal because the
tasklet handler is disabled is not an error. It means TIPC is
currently in the process of shutting down. We remove the error
logging in this case.
Signed-off-by: NErik Hugne <erik.hugne@ericsson.com>
Reviewed-by: NJon Maloy <jon.maloy@ericsson.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/tipc/handler.c

@@ -58,7 +58,6 @@ unsigned int tipc_k_signal(Handler routine, unsigned long argument)
 
 	spin_lock_bh(&qitem_lock);
 	if (!handler_enabled) {
-		pr_err("Signal request ignored by handler\n");
 		spin_unlock_bh(&qitem_lock);
 		return -ENOPROTOOPT;
 	}