sunrpc: do not pin sunrpc module in the memory

Basically, try_module_get here are pretty useless. Any other module using
this API will pin sunrpc in memory due using exported symbols.
Signed-off-by: NDenis V. Lunev <den@openvz.org>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

net/sunrpc/xprt.c

@@ -108,13 +108,10 @@ int xprt_register_transport(struct xprt_class *transport)
 			goto out;
 	}
 
-	result = -EINVAL;
-	if (try_module_get(THIS_MODULE)) {
-		list_add_tail(&transport->list, &xprt_list);
-		printk(KERN_INFO "RPC: Registered %s transport module.\n",
-			transport->name);
-		result = 0;
-	}
+	list_add_tail(&transport->list, &xprt_list);
+	printk(KERN_INFO "RPC: Registered %s transport module.\n",
+	       transport->name);
+	result = 0;
 
 out:
 	spin_unlock(&xprt_list_lock);
@@ -143,7 +140,6 @@ int xprt_unregister_transport(struct xprt_class *transport)
 				"RPC: Unregistered %s transport module.\n",
 				transport->name);
 			list_del_init(&transport->list);
-			module_put(THIS_MODULE);
 			goto out;
 		}
 	}