9p: client: remove unused code and any reference to "cancelled" function

This patch reverts commit

80b45261a0b263536b043c5ccfc4ba4fc27c2acc

which was implementing a 'cancelled' functionality to notify that
a cancelled request will not be replied.

This implementation was not used anywhere and therefore removed.

Signed-off-by: Andi Shyti <andi@etezian.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/9p/client.c b/net/9p/client.c
index 8b93cae..ba93bda 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -658,17 +658,12 @@
 
 	/*
 	 * if we haven't received a response for oldreq,
-	 * remove it from the list, and notify the transport
-	 * layer that the reply will never arrive.
+	 * remove it from the list
 	 */
-	spin_lock(&c->lock);
 	if (oldreq->status == REQ_STATUS_FLSH) {
+		spin_lock(&c->lock);
 		list_del(&oldreq->req_list);
 		spin_unlock(&c->lock);
-		if (c->trans_mod->cancelled)
-			c->trans_mod->cancelled(c, req);
-	} else {
-		spin_unlock(&c->lock);
 	}
 
 	p9_free_req(c, req);